Why does the man decided to allow the woman in his class?

A、Sheneedstotakethecourseinordertograduate.;
B、Heisimpressedwithhereagernesstocontinue.;
C、He’sbeenconvincedthatshedoeshaveadequatepreparationforthecourse.;
D、Helearnsthatshe’sstudyingfilmashermaincourseofstudy.