Answer:
The last one option C
Explanation:
The 1st one is wrong because dog's is singular but the statement had clearly mentioned that there are 3 dogs
The 2nd one is also wrong because it needs and apostrophe to show the owner of the thing (hairbrush) so it is wrong
The 3rd one is the correct one because it the apostrophe is used after the s as it is singular
Hope it helps and pls mark as brainliest : )
