In most angiosperms, when the ovule is mature, the pollen germinates on stigma, travels through style and ultimately enters the ovule. In the adjacent diagram, three possibilities of pollen tube entry are shown. What do A, B and C represent

A

A-Mesogamy, B-Chalazogamy and C-Porogamy

B

A-Porogamy, B-Chalazogamy and C-Mesogamy

C

A-Chalazogamy, B-Mesogamy and C-Porogamy

D

A and B-Porogamy, C-Chalazogamy