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: Humans contribute to environmental pollution (A) by purchasing products made from recycled products (B) by switching to energy efficient appliances (C) by leaving behind refuse on public beaches (D) by frequently recycling paper and plastic

SOLUTION: C

PROBLEM: Once the grounds frost over and the air grows chilled (A) beaches are opened (B) humans go naked (C) birds lay eggs (D) roses die

SOLUTION: D

PROBLEM: Veins carry blood which means that they (A) lack enough fluid to grow (B) cart essential substances around (C) are unessential for health (D) keep the body healthy

SOLUTION:
B