Ovule is attached to the placenta with a slender stalk, known as

Answer: Option C

The ovule is attached to the placenta with a slender stalk, known as the Hilum.
A hilum is a scar or mark left on a seed coat by the former attachment to the ovary wall or the funiculus. Hilum represents the junction of the ovule with the funicle in a seed.
A hilum can also be a nucleus of a starch grain; the point around which layers of starch are deposited. On a bean seed, the hilum is called the "eye".