The correct option is D Haploid
All algae exhibit haploid life cycle. A general life history includes both n stage and a 2n stage separated by meiosisand syngamy. Before meiosis, the individual is the diploid zygote. After meiosis, zygote develops into a haploid (1n) spore. Meiosis produces four cells from each zygote depending on the organism. The four cells would then go through mitosis and become the organism. Thus, the correct answer is option A.