Consider the line integrals (int_{C} mathbf{F} cdot d mathbf{r}) for the vector fields (mathbf{F}) and paths (mathbf{r})

Question:

Consider the line integrals $\int_{C} \mathbf{F} \cdot d \mathbf{r}$ for the vector fields $\mathbf{F}$ and paths $\mathbf{r}$ in Figure 2. Which two of the line integrals appear to have a value of zero? Which of the other two appears to have a negative value?

1 1 1 (A) (C) + x (B) (D)