The sentence that does the least to support the statement "My mother should remove the garden gnomes from the front yard" is:
OD. My mother purchased the gnomes at a yard sale.
Explanation:
A. This sentence provides a reason to support the idea of removing the gnomes as they scare the neighborhood children.
B. This sentence gives another reason to support the removal of the gnomes as they distract from the yard's natural beauty.
OC. This sentence adds to the argument for removal by stating that the father is embarrassed by the garden gnomes.
OD. This sentence does not directly support the idea of removing the gnomes. It simply mentions where the gnomes were purchased, which does not contribute to the argument for their removal from the front yard.