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 early example of harnessing wind power would be (A) unicorns (B) santas flying reindeer (C) trumps windy speeches (D) cloth on masts

SOLUTION: 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: At the end of their season lumberjacks will seed a new (A) batch of chickens (B) track of land (C) popcorn machine (D) home garden

SOLUTION:
B