Answer:
Two devices that are being used in the lines are:
C. repetition
D. rhyme/rhythm
Explanation:
Repetition is a literary device consisting of repeating the same word or phrase for emphasis or clarity. Repetition can appear in both prose and poetry, and it can also be a rhetorical device. In the lines we are analyzing here, the phrase "I'm growing" is repeated at the beginning of each line:
I'm growing fonder of my staff;
I'm growing dimmer in the eyes;
I'm growing fainter in my laugh;
I'm growing deeper in my sighs;
Rhyme is a correspondence of sounds between different words. In the lines above, we have a rhyme scheme of ABAB, that is, "staff" rhymes with "laugh" - lines 1 and 3 -, and "eyes" rhymes with "sighs" - lines 2 and 4.
As for rhythm, I believe we have an iambic tetrameter - a four time repetition of an unstressed syllable followed by a stressed one. Take a look below:
I'm growing fonder of my staff;