A. Straight
B. Sincere
C. Zig zag
D. Doubtful
✅ The correct answer is option D.
Straight : extending or moving uniformly in one direction only; without a curve or bend.
Straight : extending or moving uniformly in one direction only; without a curve or bend.
Sincere : free from pretence or deceit; proceeding from genuine feelings.
Zigzag : a line or course having abrupt alternate right and left turns.
Doubtful : feeling uncertain about something.
Dubious : hesitating or doubting.
Synonym of Dubious is Doubtful