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").

Ex Input:
speed is a measure of how fast all these move but (A) a person waiting (B) a fish swimming (C) a dog running (D) a bird flying

Ex Output:
A


Ex Input:
A glacier moved through an area years and years ago, and scientists can tell this by (A) looking at the moon (B) looking at the dogs (C) looking at the sky conditions (D) glancing at nearby stone

Ex Output:
D


Ex Input:
Scientists suggest that, due to human activities, earth has lost waterways and about half of its original forest lands, endangering many animals and plants in their natural living spaces. However, human activity seems to benefit some living things, such as (A) rats and roaches (B) saunas and pools (C) new phone numbers (D) cotton clothing

Ex Output:

A