.....well looking at the question i would have to say that the first option would be your best choice
A DONDE vamos cuando queremos comer? where do we go when we want to eat?
It’s B, because in this case the “para” means “to” while in letter A the “por” means “for” or “by”
Answer: If photosynthesis were to stop, plants would not be able to grow properly without the things they really need in the growth process and feeding other animals.
Explanation: