In double fertilisation, pollen tube enters through micropyle in
Polar nuclei
Scutellum
Embryo sac
Synergids
The entry of pollen tube through the micropyle is the normal condition known as porogamy. After entering the wall of the ovary , the pollen tube enters the Embryo sac through the micropyle end. This process results in male gamete transfer. So that double fertilisation occurs.
Option 3 is the correct answer.