The correct option is B 5
The rules of determining the number of significant figures :
1. Zeroes between nonzero digits are
significant.
2. Leading zeros to the left of the first
nonzero digits are not significant.
3. Trailing zeroes that are also to the
right of a decimal point in a number are
significant.
According to these rules the given number 0.010200 has 5 significant figures (1,0,2,0,0).