The poems in this unit express appreciation for

A. the poor.
B. the value of work.
C. things of value.
D. the question of value

C. things of value.

The poems in this unit express appreciation for several themes, including "A. the poor," "B. the value of work," and "C. things of value." These themes are often explored in different ways throughout the poems. However, it is important to note that appreciation for the question of value is not explicitly mentioned as a theme in this context.