Option A. is correct for the given condition.
Lets solve it through steps of range and functions,
First of all, Solve the equation:

(1)
(2)
So these would be the ranges of X in between 5 and -5.
Hence option A.
is correct.
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Answer:
I'm pretty sure it is (a)
Answer:
Diverge
Step-by-step explanation:
(a)
1st year: 
2nd year: 
3rd year: 
4th year: 
5th year: 
(b) The sequence is divergent, because if we take the derivative of the function with respect to n year:

This is a positive, meaning the slope of the function is positive. If we take the second derivative using product rule

This is also positive when n > 0. Therefore, the slope is positive and increasing. This means the sequence diverges.