The correct option is B Sporophyte, meiosis, spores, gametophyte
Life cycle of pteridophytes (haplo-diplontic life cycle):
Sporophyte (2n)
↓
Spore mother cells (2n)
↓ Meiosis
Spores (n)
↓
Gametophyte (n)
↓ Mitosis
Gametes (n)
↓ Fertilisation
Zygote (2n)
↓ Mitosis
Embryo (2n)
↓
Sporophyte (2n)