I think it’s D. Ocean trenches
The preposition in the given sentence "Gracie and Helen had not seen each other for 50 years" is 'for'.
<h3>What is a preposition?</h3>
A preposition is a word or phrase that appears before a noun, pronoun, or noun phrase to indicate direction, time, place, location, spatial relationships, or to introduce an object.
Prepositions include words like "in," "at," "on," "of," "to", etc.
Thus, the preposition in the given sentence "Gracie and Helen had not seen each other for 50 years" is 'for'.
For more details regarding preposition, visit:
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B. One of your troop members began to cry.
It doesn't explain why he is crying, and is the most suspenseful, but one could argue it was C, because they could have going the wrong direction, but B is the most suspenseful due to the crying and emotion in it.
Hope this helps, even though I just debated aloud.
