Chapter 5.1, Problem 5.1QQ

In Figure 5.5 (a)-(d), a block moves to the right in the positive x-direction through the displacement Δ $\stackrel{\to }{\text{x}}$ while under the influence of a force with the same magnitude $\stackrel{\to }{\text{F}}$. Which of the following is the correct order of the amount of work done by the force $\stackrel{\to }{\text{F}}$, from most positive to most negative? (a) d, c, a, b (b) c, a, b, d (c) c, a, d, b