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I think the answer you are looking for is biography.
A participle is a verb that functions as an adjective which modifies the given noun or pronoun. From the given sentence above, the participle is the word "loosened". This word is used to describe the noun rocks. Thus, the answer is letter A.
The plot of "The Signalman" reaches a climax when signalman dies. As you know, the main characteristic of climax is that it is the most emotional part of a story that provides a lot of interest and suspense to a reader. The death of signalman is the highest point of emotional intensity of the plot as the loved protagonist unexpectedly (or undesirably) passes away and put an end to the story.