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The answer to your question is letter b) 21

Step-by-step explanation:

Question: f(g(-1)) = ?

F(x) = 2x -3           g(x) = x2 + 11

f(g(x)) = 2(x2 + 11) -3             simplify

f(g(x) = 2x2 +22 - 3 = 2x2 +19    first result

f(g(-1)) = 2(-1)2 + 19      substitution

           = 2(1)  + 19       simplify

           = 2 + 19

            = 21                last result