Question

corn plants and lilies have more similarities in their leaves than corn plants and potato plants have. unlike potato plants, corn plants and lilies both have leaves with parallel veins. this piece of evidence supports the following claim:
corn plants share a more recent common ancestor with lilies than with potato plants.
which additional piece of evidence best supports the same claim?
corn seeds have a single cotyledon, or embryonic leaf, that stays underground when the seed sprouts. lily seeds have a single cotyledon that stays underground or sprouts above ground, depending on the species. potato seeds have two cotyledons.
corn plants perform a type of photosynthesis called c4 photosynthesis, which conserves water in hot, dry environments. lilies and potato plants perform the more common c3 photosynthesis.
corn plants have been selectively bred to produce larger, more numerous seed keels for food. lilies have been selectively bred to produce a variety of flower shapes, colors, and fragrances. potatoes have been selectively bred to produce larger, less bitter tubers for food.

Explanation:

In biology, the number of cotyledons (embryonic leaves) is an important characteristic for classifying plants. Corn and lilies having a single cotyledon (monocots) while potato has two (dicot) shows a closer evolutionary relationship between corn and lilies. Photosynthesis type (C4 vs C3) in the second option differentiates corn from both lilies and potatoes, which is not supporting the claim of corn - lily closer relation. Selective breeding (third option) is a human - induced trait change and not an evolutionary relationship indicator.

Answer:

The first option (Corn seeds have a single cotyledon... Potato seeds have two cotyledons) best supports the claim.