Answer:
b. (My spirit not awakening, till the beam
Of an Eternity should bring the morrow.)
d. ('Twere better than the cold reality
Of waking life, to him whose heart must be,)
Step-by-step explanation:
Enjambment is a poetic device used by poets where the lines in the poem are continued into the next line without the use of any punctuation mark. There is no pause, with the meaning running over to the next line without any terminal punctuation.
The poem "Dreams" by Edgar Allen Poe uses this 'enjambment' in much of the whole poem. It can be seen in the lines in bold-
Oh! that my young life were a lasting dream!
My spirit not awakening, till the beam
Of an Eternity should bring the morrow.
Yes! tho' that long dream were of hopeless sorrow,
'Twere better than the cold reality
Of waking life, to him whose heart must be
The enjambment can be specifically found in between "beam-of" and "reality-of".