Select the most appropriate option to fill in the blank.

It was the last ______ of the puzzle.

piece

The most appropriate option to fill in the blank is piece.

The word piece means a part of something, especially a small or detached part. In this case, the sentence is saying that it was the last piece of the puzzle. This means that it was the last part of the puzzle that needed to be put in place in order to complete the puzzle.

The other options do not make sense in the context of the sentence.

• Priest is a person who is authorized to perform religious duties.
• Pique means to cause someone to feel slighted or resentful.
• Peace means a state of tranquility or quiet.