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Math 20 15, a college entrance examination simulation problem.
Substitute (s, t) into a straight line to get t=-(2s+ 1).

∫f(x) is monotonically increasing, and f(t)≤f(ms).

∴t≤ms, that is,-(2s+1) ≤ ms.

∴(m+2)s≥- 1

∵m∈

I.e. greater than 0.

∴s≥- 1/(m+2)

∴m∈[- 1, 1] substitution

Choose answer B.