Which of the following represents the correct sequence in Pteridophytes?

• A
  Sporangium $\rightarrow$ Sporophyll $\rightarrow$ Spore $\rightarrow$ Strobilus
• B
  Spore $\rightarrow$ Sporophyll $\rightarrow$ Sporangium $\rightarrow$ Strobilus
• C
  Spore $\rightarrow$ Sporangium $\rightarrow$ Strobilus $\rightarrow$ Sporophyll
• D
  Spore $\rightarrow$ Sporangium $\rightarrow$ Sporophyll $\rightarrow$ Strobilus