Answer: The correct answer is 3) A gametophyte is a haploid phase.
Alternation of generation is a type of sexual life cycle that is found in all plants and some algae. In these organisms, a multicellular gametophyte that is haploid phase alternates with a multicellular sporophyte, which is a diploid phase. Sporophyte produces haploid spores by meiosis, which develop into multicellular haploid gametophyte.
Thus, option 3) is the right answer.
