Question

two forces F1 and F2 acting at a point have a resultant F. If F2 is doubled, F is also doubled. If F2 is reversed in direction, then also F is doubled, then

options A. F1:F=1:1 B. F2:F=root3:root2
C. F1:F2=root2:root3 D. F1:F2:F=root2:root3:root2