A rigid wire consists of a semicircular portion of radius $$R$$ and two straight sections. The wire is partially immerged in a perpendicular magnetic field $$\vec{B} = B_0 \hat{j}$$ as shown in figure. The magnetic force on the wire if it has a current $$i$$ is :

A

$$-iBR\hat{j}$$

B

$$2iBR\hat{j}$$

C

$$iBR\hat{j}$$

D

$$-2iBR\hat{j}$$