In this task, you are given two facts, and a multiple-choice question. Based on the given facts, answer the question with index of the correct option (e.g, "A").

Fact1: Loss of ozone has created an ozone hole over Antarctica., Fact2: Antarctica's ozone layer is threatened by depletion., Question: What can loss of ozone lead to? (A) irritants (B) bad weather (C) Car accidents (D) ozone hole (E) rain (F) A hurricane (G) stormy weather (H) destroyed crops
D

Fact1: better senses have a positive impact on an animal 's survival, Fact2: All dogs are animals ., Question: what can have a positive impact on survival with better senses? (A) pugs (B) deer (C) pigs (D) mice (E) dog (F) cats (G) bird (H) cows
E

Fact1: Amphibians are the first true tetrapods, or vertebrates with four limbs., Fact2: Modern classifications of the tetrapods rely on the structure of the skull ., Question: what are amphibians classified by? (A) organ (B) ovaries (C) colors (D) feet (E) alleles (F) genus (G) skull (H) Length

G