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: Antigens are molecules that the immune system recognizes as foreign to the body., Fact2: Children are born with an immature immune, or defense, system., Question: What are molecules that the defense system recognizes as foreign to the body? (A) Allergies (B) lungs (C) antigens (D) bacteria (E) parasites (F) atoms (G) red blood cells (H) acetic acid
C

Fact1: when a body of water receives more water than it can hold , a flood occurs, Fact2: Flood probability is based on past floods., Question: How do we determine the probability of receiving more water than a body can hold? (A) evaporation (B) climate (C) The past (D) watershed (E) Dilution (F) energy usage (G) Temperature (H) salinity
C

Fact1: force causes the speed of an object to increase, Fact2: Acceleration is the increase in speed or velocity over a period of time., Question: What can result when force acts on a moving object? (A) hyperthyroidism (B) heat energy (C) permineralization (D) acceleration (E) flow of electrons (F) friction (G) kinetic energy (H) chemical reaction

D