The word spring is used to describe a piece of coiled metal that can be gathered by the word mechanism. Thus, option B and the mechanism are correct.
What is a context clue?
Context clue can be defined as the data or information that is presented to give any sort of additional information about the context of the data. This clue is usually given in books or thesis so that one can easily understand what is being told in the data.
Raj removed the clock cover and because of that, the spring came loose from the mechanism. This clearly shows that the spring that has fallen is from the clock's machine that is used, and machines are typically made of metal.
So, we can say that spring here in this sentence act as a noun that is made of a metal and that can be identified as it is a machine. Therefore, option B and the mechanism is the correct option.
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