Choose the pair in which the words are differently related from the rest.

The correct answer is C. Sweet: Sour.

In the other pairs, the words are opposites. Hard is the opposite of soft, long is the opposite of high, and pointed is the opposite of blunt. However, sweet and sour are not opposites. They are both flavors.

Sweet is a pleasant taste that is often associated with sugar and honey. Sour is a sharp, acidic taste that is often associated with lemons and vinegar.