Step 1: Understanding prepositions.
Prepositions are words that link nouns, pronouns, or phrases to other words in a sentence. They show the relationship between the subject and the rest of the sentence. In the given sentence, "The shop is at the end of the road," we are asked to identify the preposition.
Step 2: Identifying the preposition.
In the sentence, "at" is used to describe the location of the shop. It shows the relationship between the shop and its position relative to the end of the road. Therefore, "at" is the preposition.
Step 3: Conclusion.
Thus, the correct answer is (C) at, as it functions as a preposition in this sentence.
Final Answer: (C) at.