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

The correct answer is A. Aphid : Paper.

Aphids are small insects that feed on plant sap. They can cause significant damage to crops, but they do not eat paper. Moths are insects that feed on a variety of materials, including wool. Termites are insects that eat wood. Locusts are insects that can eat a variety of plants, including crops.

Aphids are different from the other three options because they do not eat paper. Moths, termites, and locusts all eat materials that are made from plants or animals. Aphids, on the other hand, only eat plant sap.