The Graph Of $f$ Is Concave Down For $-2<x<9$ Which of the Following Is the Largest?

A)

Multiple Choice

The graph of $f$ is concave down for $-2<x<9$ . Which of the following is the largest?

A) $\frac{f(5) -f(-1) }{5+1}$
B) $\frac{f(8) -f(6) }{8-6}$