What’s the appropriate way to write dryads are mythological spirts who make its homes in trees

Dryads are mythological spirits who make their homes in trees.

Explanation:

1) correct spelling of spirts > spirits

2) Dryads is plural, so you need the pronoun to be 'their' not 'its'

3) I changed home> homes because presumably the dryads live in multiple homes, but  it could be argued that 'make their home' is an expression and is acceptable.  

4) I would not add a comma before the 'who' because in this sentence it seems that making their homes in trees is an essential part of defining who Dryads are.

what

explanation:

the correct answer is option d. none of these. it is noted that options a, b, and c share the same content.

despite the valid answer provided at the last sentence of each of the options, a question/answer format shouldn't include humourous themed responses such as "you bet your thermal pj's we do." - unless of course, the answer is carried out in an informal environment. this could be replaced with a simple "yes" or "it is necessary".

the question should be re-phrased to a more appropiate syntaxis. instead of "do we need the greenhouse effect? ", it should be written as "is the greenhouse effect necessary? " in order to give it a general scope, instead of limiting the answer to the needs of "we" the humans.