To solve this problem, we need to identify the part of the seed that forms the root during germination.$\newline$Let's analyze the labeled parts in the given seed diagram:$\newline \bullet$A: This part is typically the seed coat, which protects the seed.$\newline \bullet$B: This part is often the cotyledon, which provides nutrients to the seedling.$\newline \bullet$C: This part is the radicle, which is the embryonic root. It is destined to form the root when the seed germinates.$\newline \bullet$D: This part is usually the plumule, which develops into the shoot.$\newline$Therefore, the correct answer is Option 1: C, as it represents the radicle.