Correct Answer: pair

Solution : The correct choice is the fourth option .

Pair means two items that are matched or considered together. In the context of the sentence, it suggests that the speaker only ate a pair of apples, indicating two apples.

The meanings of the other options are as follows:

• Pier is a structure built over water, typically for docking ships or boats.

• Pear is a type of fruit.

• Pare means to remove the outer covering or skin from something, often in the context of preparing food.

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Therefore, the complete sentence would be: "Yesterday, I ate only a pair of apples for my dinner."