Hi there!
For each option, let's figure out the percentage for each one. We know that 65% of people wanted a pool.
A - 6/10 = 60%
B = 13/20 = 65%
C = 10/65 = 15%
D = 5/13 = 38%
ANSWER:
B - Elisa surveyed 20 people and 13 people were in favor of having a swimming pool
Hope this helps!! :)
If there's anything else that I can help you with, please let me know!