The sentence in which the word snow functions as an object of the preposition is when I dropped my ring into the snow, I panicked. Thus, the correct answer is A.
What is an object of a preposition?
A noun that joins a preposition to produce a prepositional phrase is called the object of a preposition. The preposition has an effect on the object or refers to it.
In the given sentence preposition will be into and snow will be considered as noun. Here the preposition "into" produce a phrase with the noun "snow" as an object of the preposition located after the preposition.
Therefore, option A when I dropped my ring, I panicked, is the correct answer.
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