Choose the option that puts the following steps in the correct sequence
1. An electric sensor records the signal's travel time. 2. A transducer changes the signal into a thump on the rock. 3. An electrical signal is delivered. 4. The wave travels through the rock.
A) 4, 2, 3, 1
B) 3, 4, 1, 2
C) 3, 2, 4, 1
D) 4, 1, 2, 3
Answer: C
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