Answer:
C). To be really catchy and memorable.
D). They want the reader to read at a bouncy pace.
Explanation:
The Trochaic meter is described as the kind of metrical foot comprising of two syllables where a stressed syllable is followed by a short/unstressed syllable.
The key reason for which an author uses this meter is to make the text sound different and unnatural that helps in grabbing the readers' attention and making it memorable for them. Another reason can be the bouncy or flowy pace that it provides poem as the line ends with a short/unstressed syllable which adds fluidity into the succeeding line. Thus, the options C and D are the correct answers.
