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: water vapor condensing in clouds causes rain, Fact2: If it's raining AND barometer is steady, then predict rain., Question: How can water vapor be detected? (A) Thermometer (B) radiography (C) A computer (D) satellites (E) Barometer (F) Evaporation (G) Windmills (H) Solar panels
E