The question asks for a diagrammatic presentation of developing follicle events in the human ovary. Based on the standard biological sequence of ovarian follicle development:
$1$. Primary follicles develop into secondary follicles.
$2$. Secondary follicles develop into tertiary follicles.
$3$. Tertiary follicles develop into the Graafian (mature) follicle.
$4$. After ovulation, the ruptured follicle transforms into the corpus luteum.
Given the standard sequence, identify the correct labels for $C$ and $E$ in a typical diagram of this process.

• A
  $C=$ Corpus luteum, $E=$ Mature follicle
• B
  $C=$ Secondary follicle, $E=$ Mature follicle
• C
  $C=$ Mature follicle, $E=$ Corpus luteum
• D
  $C=$ Primary follicle, $E=$ Corpus luteum