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: a mirror is used for reflecting light, Fact2: Light seems to travel in rays or beams., Question: what can a mirror be used to reflect? (A) noble gases (B) air particles (C) glass (D) focusing a lens (E) rays or beams (F) photons (G) sun's heat (H) an electron lens
E

Fact1: matter vibrating can cause sound, Fact2: Thus, sound is a wave in air ., Question: what can matter vibrating cause? (A) Pollution (B) energy (C) Relieve pain (D) kinetic energy (E) wave in air (F) Energy. (G) murmur (H) Greenhouse gases
E

Fact1: Collar cells have tiny hairs that trap the particles., Fact2: Collar cells each have a flagellum., Question: What traps particles? (A) detritus and detrital organism (B) sunlight (C) thick, slimy mucus (D) microbes and mussels (E) flagellum or tiny hairs (F) free space (G) moonlight (H) tubular organ

E