Which of the following processes represents microsporogenesis?

• A
  $PMC \rightarrow$ (Meiosis) $\rightarrow$ Microspores
• B
  $MMC \rightarrow$ (Meiosis) $\rightarrow$ Microspores
• C
  $PMC \rightarrow$ (Mitosis) $\rightarrow$ Microspores
• D
  $MMC \rightarrow$ (Mitosis) $\rightarrow$ Microspores