A. IS THE ANSWER!
STEP-BY-STEP Explainaton
A, B, D are functions.
(First, second, and fourth response)
You can see which is function since for everyone input only has one value. You can also use the vertical line test.
If 200/8=25 per hour, then i divided that by 2 to get 12.5 for 30 minutes.
Answer: The simplest form of 35/40 is 7/8.