Activation of H⁺-ATPase in guard cells results in:
Pick B: Hyperpolarization of membrane. Thinking through STOMATA MOVEMENT step by step rules out the lookalikes and leaves Hyperpolarization of membrane. Skip these: A) Depolarization of membrane; C) Inhibition of ion uptake; D) Stomatal closure. 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.