5s + 2m − 7s + 8m =(A) −2s + 10m(B) 2s + 10m(C) 2s − 10m(D) −2s + 6m

The first step is to combine like terms.

The like terms are 5s and -7s, and 2m and 8m.

When you combine 5s and -7s, you get -2s.

When you combine 2m and 8m, you get 10m.

So, the simplified expression is -2s + 10m.

Therefore, the answer is (A) -2s + 10m.