Detailed Instructions: 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").
Problem:Fact1: sonar is used to find the location of an object, Fact2: Active Sonar Active sonars transmit acoustic energy and detect targets by echolocation., Question: what is used to find objects underwater? (A) echolocation (B) a hydraulic system (C) heat energy (D) Electrical energy (E) dolphins (F) mussels (G) by indirect light (H) rays or beams
Solution:
A