Answer:
Second option: Animals bred through pet shops suffer health problems.
Third Option: People need to adopt animals instead of going to pet shops.
Step-by-step explanation:
These two ideas best summarize the ideas presented in the excerpt. Speaker's main purpose is to persuade the audience not to buy animals from pet store instead adopt them from animal shelter, he (speaker) needs to give audience a reason why they should not buy from pet stores. This reason is provided in the second option i.e these animals suffer health problems. The third option is the conclusion and purpose of the speech. So this point too is required for summarizing the speech.
First and fourth options, although relevant, are less important when considering the purpose of the speech.
Fifth option is neither part of the speech, not speaker's purpose.