Final answer:
The speaker in 'In My Heart's Shelf' compares their mother to an old book of poems, which signifies the precious and emotional memories shared with her.
Step-by-step explanation:
In the poem "In My Heart's Shelf" by A. Gautam, the speaker compares his or her mother to an old book of poems. This comparison reflects the depth of emotions and memories stored within the speaker's heart, akin to poetry that bears significance and sentimentality over time. The other options, an old music record, a wrinkled passport, or an ornament of gold, do not match the comparison made in the poem.