What could expression1 and expression2 be, respectively, in order to produce output –8, 16?

Given the code fragment: What could expression1 and expression2 be, respectively, in
order to produce output –8, 16?

A.
A + +, b – –

B.
+ +a, – -b

C.
+ +a, b- –

D.
A+ +, – – b