Hi, Rosestar. I think you need to double check your post first. Expressions except for 185 do not show correctly.
A feasible way to solve this question is first find the expressions of the three and then compare them with the provided expression.
For example, let's consider Jill's share.
::"Jill will be picking up the water bill as well as half of the electric."
1. The water bill: $20 per person. There are 3 persons in total, so the water bill is 20x3=?;
2. half of the electric bill: The electric bill is $250 a month; so its half is 250x0.5=?;
Now to calculate Jill's payment, we just need to add the two values in Steps 1&2, right? Say it is equal to X, then you further check whether X is provided among A, B, C, D.