The correct option is B A- Porogamy, B- Chalazogamy, C- Mesogamy.
Based on the route of entry of the pollen tube, fertilisation is of different kinds. A pollen tube carrying male gametes must enter into the embryo sac to perform the double fertilisation.
Porogamy- fertilization occurs when the pollen tube enters via the micropylar end.
Chalazogamy- fertilization that occurs when the pollen tube enters via chalazal end.
Mesogamy- Fertilization that occurs when the pollen tube enters via the integuments.