Which of the following have same number of significant figures? (A)...

All nonzero digits are significant. All zeros that are found between nonzero digits are significant. Leading zeros (to the left of the first nonzero digit) are not significant. Trailing zeros for a whole number that ends with a decimal point are significant.The number of significant figures of the given numbers are as follows:
Numbers                No. of significant figures
(A) $0 . 00253$                 $3$  
(B) $1 . 0003$                   $5$
(C) $15 . 0$                      $3$
(D) $163$                         $3$
$∴$(A), (C) and (D) have the same number of significant figures.