On a field trip,a student in a marine biology class collects an organism that has differentiated organs,cell walls of cellulose,and chloroplasts with chlorophyll a.Based on this description,the organism could be a brown alga,a red alga,a green alga,a charophyte recently washed into the ocean from a freshwater or brackish water source,or a land plant washed into the ocean.The presence of which of the following features would definitively identify this organism as a land plant?
A)alternation of generations B)sporopollenin C)rings of cellulose-synthesizing complexes D)flagellated sperm E)embryos