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?
a. the method of loci
b. a mnemonic device
c. chunking
d. rhyming

A mnemonic device.

Explanation:

A mnemonic device (also known as memory device, or memory aid) is any learning tool that helps our brain easily remember any important information (from ideas and phrases to facts and large amounts of information) through patterns. Mnemonic devices can be in the form of a special rhymes or poems, songs, acronyms, images, phrases, sentences, outlines, among other tools.