If sperms of moss and fern are put together near the archegonium of fern, only the sperms of fem find entry into archeogonium, the reason being that
A. sperms of moss are killed by larger sperms of fern
B. archegonia of fern secretes a toxoid to kill moss of fern.
C. archegonia of fern secrete mucilage rich in malic acid to attract sperms of fern only
D. sperms of moss are less motile and find difficulty in entering archegonium.
