Alternation of generations has both a haploid and diploid multicellular stage. Hence, Option D is correct.
What is alternation of generation in plants?
It is a type of metagenesis where the alternation of a sexual phase and an asexual phase is observed in living organism. Algae, fungi and plants are the organism where this type of cycle are seen.
In this cycle sexual phase is called as gametophyte generation, which produce haploid gametes.
The asexual phase called as sporophyte generation which produces diploid spores asexually.
In case of higher plants like bryophytes the gametophytic generation is the dominant life phase, whereas sporophyte generation is dominant in angiosperms and gymnosperms.
In Humans, alternation of generations is not observed as there is no multicellular haploid stage.
Thus, Option D is correct.
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Your question was incomplete. So the probable question was
Which type of life cycle has both a haploid and diploid multicellular stage?
a. an asexual life cycle
b. diploid-dominant
c. haploid-dominant
d. alternation of generations
