Submit the application anyway and they may let you pay it later.
Answer:
The boy sat. That could be a subject. The predicate is the half-sentence you have right now. So, it could be The boy sat in the window seat on the plane.
Explanation:
A subject contains the noun. A predicate contains what the noun does.
Answer:
so that they could better understand the diagnosis of ASD and for people who have it...
I would say A for question 4