7. A spinner with 3 sectors is shown in the figure below. The measures of the central angles of the red, white, and blue sectors, in that order, are in the ratio 2 : 3 : 4. If the spinner is fair, what is the probability that the arrow stops in the red sector?

(Note: Assume the arrow stops in a sector and not on a line. )

A.

B.

C.

D.

E.