The correct answer is D. They made poems easier to memorize.
Explanation:
In poems, alliteration refers to using words with the same consonant sound in a verse or multiple verses. This device makes the poem more memorable or easy to remember as the repetition forms a sound pattern. Also, by remembering which consonant sound is repeated it is easy to remember the words of each verse. Similarly, the use of the meter or a specific structure of verses (number of syllables in each verse and organization of stressed/unstressed syllables) makes the poem to be predictable and easy to remember. Moreover, these two features were more commonly used in poems during the 14th and 15th centuries as in this way the audience could better remember poems.
