Final answer:
The equation B = kpx, when solved for k, gives k = B / (px), so the correct answer is (B) k = B div (p times x).
Step-by-step explanation:
The question asks us to solve the equation B = kpx for the variable k. To isolate k, we need to divide both sides of the equation by the product px, which will yield k = B / (px). Therefore, the correct answer is (B): k = B div (p times x).