In this task, you are given two facts, and a multiple-choice question. Based on the given facts, answer the question with index of the correct option (e.g, "A").

Fact1: Differentiation is the process by which unspecialized cells become specialized., Fact2: T helper cells differentiate to Memory cells and effector cells., Question: memory cells and effector cells are what compared to T helper cells (A) dermal & vascular tissue (B) antibodies (C) fetal development (D) antigens (E) occurs over a wide range (F) prokaryotic cells (G) unicellular organisms (H) more specialized
H

Fact1: Courtship is behavior that is intended to attract a mate., Fact2: Complex courtship rituals precede mating., Question: What are behavior that is intended to attract a mate? (A) a doorbell (B) firm hugs (C) Complex rituals (D) Riding a bike (E) Behaviour modifications (F) Magnets (G) honeybees (H) Friendship
C

Fact1: Temperature falls from lower to higher altitudes., Fact2: Temperatures are cooler in the higher altitudes of the mountains., Question: Temperature falls from lower to higher where? (A) space (B) burning coal (C) underground (D) mountains (E) frontal zones (F) the ground (G) deserts (H) burrows
D