Which one of the following species has a many electrons

Step 1 
In the atom's nuclide symbol,
${\displaystyle z{X}^A}$ 
Z-represents the atomic number which is number of protons present in an atom. 
X- element symbol. 
A-Mass number which is the sum of number of protons and number of neutrons present in its nucleus. 
Hence, 
${\displaystyle \text{number of neutrons in an atom}=\text{mass number}\left(A\right)-\text{atomic number}\left(Z\right)}$ 
Step 2 
a. ${\displaystyle 6C^{14}}$ 
The atomic number of this nuclide is 6.
This atom has six protons and six electrons, so to speak.
Mass number ${\displaystyle =14}$. 
${\displaystyle \text{number of neutrons in an atom}=\text{mass number}\left(A\right)-\text{atomic number}\left(Z\right)}$ 
Hence, ${\displaystyle \text{Number of neutrons}=14-6=8}$ 
So, number of neutrons are more than number of electrons. 
This is not the correct option. 
Step 3 
b. ${\displaystyle 14C^{2+}}$ 
Atomic number of carbon is six. 
Mass number ${\displaystyle =14}$ 
Since it has +2 charge, so the number of electrons ${\displaystyle =6-2=4}$ 
${\displaystyle \text{number of neutrons in an atom}=\text{mass number}\left(A\right)-\text{atomic number}\left(Z\right)}$. 
Number of neutrons ${\displaystyle =14-6=8}$ 
So, number of neutrons are more than number of electrons. 
This is not the correct option. 
Step 4 
c. ${\displaystyle 40C{a}^{2+}}$ 
Atomic number is 20. 
So, number of protons ${\displaystyle =20}$. 
Mass number is 40. 
${\displaystyle \text{number of neutrons in an atom}=\text{mass number}\left(A\right)-\text{atomic number}\left(Z\right)}$ 
So, number of neutrons ${\displaystyle =40-20=20}$ 
Since it is a positive ion with charge +2. 
So, number of electrons ${\displaystyle =20-2=18}$ 
Number of electrons are less than number of neutrons. 
So, this is not the correct option. 
Step 5 
e. ${\displaystyle 19F^{-}}$ 
Mass number ${\displaystyle =19}$ 
Atomic number ${\displaystyle =9}$ 
${\displaystyle \text{number of neutrons in an atom}=\text{mass number}\left(A\right)-\text{atomic number}\left(Z\right)}$ 
Number of neutrons ${\displaystyle =19-9=10}$ 
Since, it is a negative ion, it is formed by gaining electron. 
-1 charge indicates that the atom gained one electrons. 
Hence, 
number of electrons ${\displaystyle =9+1=10}$ 
This is not the correct option. 
because in this nuclide, 
${\displaystyle \text{number of neutrons}=\text{number of electrons}}$. 
Step 6 
d. 1H 
Atomic number ${\displaystyle =1}$ 
Mass number ${\displaystyle =1}$ 
${\displaystyle \text{number of neutrons in an atom}=\text{mass number}\left(A\right)-\text{atomic number}\left(Z\right)}$. 
Number of neutrons ${\displaystyle =1-1=0}$ 
It has one electron. 
Since it is a neutral atom, so number of electrons = number of protons. 
Hence, the given nuclide has one electron and no neutrons. 
This is the correct option. 
Answer is option d.