Answer:
ABAB (alternate rhymes)
Explanation:
The poem "A Psalm of Life" features an ABAB-type rhyme scheme, which is called alternate rhymes.
Alternate rhymes combine alternately, following the ABAB scheme. In this case, the first line of the stanza only rhymes with the third line and the second line, it only rhymes with the fourth line of the stanza.
This can be confirmed by the first stanza of the poem, which is below:
"Tell me not, in mournful numbers, - A
Life is but an empty dream! - B
For the soul is dead that slumbers, - A
And things are not what they seem. - B"
