Which statement can be combined with its converse to form a true biconditional?

A. If an angle is a straight angle, then its sides are opposite rays.

B. If the measure of an angle is 30, then it is an acute angle.

C. If a ray is the perpendicular bisector of a segment, then the ray divides the segment into two congruent segments.

D. If two lines intersect, then the two lines are not skew.