In a pteridophytes life cycle, the correct sequence of stages will be given as follows: B ⟶ Meiosis in spore mother cells A ⟶ Prothallus stage D ⟶ Formation of archegonia and antheridia in gametophyte E⟶ Transfer of antherozoids to the archegonia in presence of water C ⟶ Fertilisation will occur So, the correct sequence is B⟶A⟶D⟶E⟶C