Strigolactones primarily suppress:
Pick C: Shoot branching. Thinking through Striglactone step by step rules out the lookalikes and leaves Shoot branching. Skip these: A) Root elongation; B) Leaf senescence; D) Seed germination. For hormones and genes, match the molecule or gene to its real role, not a neighboring pathway.
Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.