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").

Which is nonmagnetic? (A) nail (B) washing machine (C) traffic cone (D) refrigerator
C

What could be used to find out how much carpet is needed for a room? (A) a tape measure (B) a compass (C) a barometer (D) a beam balance
A

which of these could lead to the introduction of new plant species to a place? (A) a botanist introducing them (B) a dog traveling through a field (C) a farmer introducing them (D) all the mentioned options

D