The main effect of the word "decaying" in this sentence from "Sharks' Teeth" is that it suggests a lack of life, as stated in option C and explained below.
The adjective "decaying" is used to refer to anything that is decomposing, rotting, or collapsing. In the passage from "Sharks' Teeth," it is used to refer to the old cabins that lined the beach.
In this particular case, the word "decaying" implies the lack of life in the cabins. The reason why the cabins are rotting away is the fact that no one is taking care of them. There is no one there to inhabit and renovate the cabins. As a matter of fact, they have been abandoned for quite a long time:
With the information above in mind, we can select option C as the correct answer for this question.
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