My mother vowed several years ago that she would never own another pet . " They just break your heart when they die and I ca n't take it anymore . " I agree with her .

Based on the preceding passage, choose your answer for question What is the reason I came to agree with my mother about pets ?
Options:
[i] None of the above choices .
[ii] A pet is the reason that my mother died .
[iii] I learned how messy pets are .
[iv] I experienced my dog dying .
The answer is:
[iv]