In this task, you are given a multiple-choice question and you have to pick the correct option. Answer with option indexes (i.e., "A", "B", "C", and "D").

A plant's roots break down rocks as the roots do what? (A) decay (B) grow old (C) develop (D) dcerease
C

Humming birds may help the growth of (A) cars (B) buildings (C) ants (D) tulips
D

A bird species may decide to relocate to hotter areas when weather (A) sears (B) cools (C) warms (D) burns

B