The correct option is B Integumented megasporangium
Ovule is also called as integumented megasporangium. After fertilisation, the ovule transforms into seed and the ovary develops into a fruit.
Embryo sac is present within the ovule. Zygote and PEN are formed inside the embryo sac after double fertilisation. Zygote develops into an embryo and PEN develops into the endosperm.
These changes in embryo sac transform ovule into seed.