TASK DEFINITION: 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").
PROBLEM: an area of low-lying ground near to a river is at risk of (A) over fishing (B) balloon landings (C) droughts (D) H20 accumulation

SOLUTION: D

PROBLEM: A rock may be used as a shelter by a (A) chicken (B) spider (C) giant squid (D) deer

SOLUTION: B

PROBLEM: Acid rain may effect things in ways such as (A) causing grass to grow greener (B) creating craters in mountains (C) turning city streets to slush (D) marine life becomes inedible

SOLUTION:
D