Locke Argued That Our Idea of Heat Represents Heat, but the Idea

Locke argued that our idea of heat represents heat, but the idea of heat doesn't resemble heat itself, just as the word

A) heat represents heat, but it doesn't resemble heat.
B) porcupine represents porcupines, but it doesn't resemble a porcupine.
C) pain represents pain, but it doesn't resemble pain.
D) word represents words, but it doesn't resemble a word.