To remember the four bases found in DNA-thymine, guanine, adenine, and cytosine-Luke makes up a sentence using the first letter from each base as the first letters for his words, repeating to himself, "The Girl Ate Cookies." Which of the following did Luke use in this scenario?
1. The method of loci
2. A mnemonic device
3. Chunking
4. Rhyming

2)

A mnemonic device

Explanation: A mnemonic is a tool or memory aid that helps people to remember or memorize things easily. It helps you to remember an idea or phrase with a pattern of letters, numbers, or relatable associations. Mnemonic devices may include special rhymes and poems, acronyms, images, songs, outlines, and other tools. In the question Luke makes up a sentence using the first letter from each base as the first letters for his words, repeating to himself to help him remember more easily the bases of DNA. In other words Luke formed mnemonics using the first letters of the DNA bases to remember them easily.