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: which form of transportation has zero emissions? (A) motorbikes (B) speed boats (C) hybrid cars (D) pedal bikes

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: If someone is experiencing frequent falls (A) they should move out of their house (B) they should just stop trying to walk (C) they should try wearing slicker bottomed shoes (D) they should try putting down carpet or throw rugs

SOLUTION:
D