Amutation occurring in a human can be passed
from parent to offspring when it occurs in a
(1) lung cell, due to exposure to a toxic gas
(2) gamete formed in the ovary
(3) body cell undergoing mitosis
(4) heart cell with chromosome damage

The correct answer is 2. 

A mutation can only be passed on to offspring if it occurs in the sex cell of the parent, which is what then forms the offspring. This renders all the other answers incorrect, because they do not happen in the gametes of ovaries or testes (the sex organs of females and males, respectively). 

Ais your right answer

D.) domain, kingdom, phylum, class, order, family, genus, species