Please help me out quickly

Consider the net revenue function given by S(p, u, v) = R(p, v) - E(p, u ) in our usual notation. Letting m denote the vector of imports, Select one: O a. S(.) is convex in p and Sp=m. O b. S(.) is convex in p and Sp=-m. O c. S(.) is concave in p and Sp=-m. O d. S(.) is concave in p and Sp=m