Among the following, the correct options for pre-fertilization events are:

$\left(\mathrm{a.}\right)$ Gametogenesis
$\left(\mathrm{b.}\right)$ Gametes transfer
$\left(\mathrm{c.}\right)$ Growth of pollen tube
$\left(\mathrm{d.}\right)$ Syngamy
$\left(\mathrm{e.}\right)$ Embryogenesis

Syngamy or fertilisation is the fusion of male gamete with female gamete which results in the formation of zygote. This zygote undergoes mitosis, and this results in the formation of embryo by a process called embryogenesis. Thus, syngamy and embryogenesis are post-fertilization events.