I believe the answer is D, but not 100%
        
                    
             
        
        
        
It would be C) atoms of the opposite charges. iconic bonds are formed by the attraction of two atoms of the opposite charge. 
Hope this helps :) 
can you please make this the brainiest answer it would really help me. thank you :) 
        
             
        
        
        
Answer:
The least count of vernier calipers is 0.01 g.
(B) is correct option.
Explanation:
Given that,
The digit that would have to be estimated in reading this instrument,
According to figure,
We need to calculate the pitch
Using formula of pitch

Put the value into the formula


We need to calculate the least count of vernier calipers
Using formula of least count

Put the value into the formula


Hence, The least count of vernier calipers is 0.01 g.
(B) is correct option.