Haploid endosperm is a typical feature of gymnosperms.
Mucor has biflagellate zoospores.
Brown algae have chlorophyll a and c and fucoxanthin.
Archegonia are found in Bryophyta, Pteridophyta and Gymnosperms.
Brown algae is also known as phaeophyceae. It is a group of marine multicellular algae, it has a critical role in marine environments. Its brown color is due to the presence of the pigment fucoxanthin. It also consists of pigments chlorophyll a and c. Archegonia is the female reproductive part of a flask-shaped structure. It contains a neck and a swollen base, where the neck consists of one or more layers of cells and the swollen part contains the egg. It is found in Bryophytes (eg: ferns and mosses), gymnosperms (eg: cycads and conifers), and Pteridophyta (eg: azolla). Gymnosperms don't have double fertilization; the endosperm is haploid and is formed by the repeated division of haploid megaspores and later develops into the female gametophyte with haploid chromosomes. Mucor belongs to the Kingdom Fungi and division zygomycota. Zygomycota have sexual spores called zygo-spores and most of them lack flagella. So, the correct answer is option B.