in this illustration, which site is an example of a trench? a b c d

Brief Explanations:

A trench is formed at a subduction zone where an oceanic plate is forced under another plate, creating a deep depression. Looking at the diagrams, site C shows a subduction - like scenario with a deep, narrow depression typical of a trench. Sites A and B seem to show volcanic or mid - ocean ridge - like features, and D doesn't match the trench structure.

Answer:

C