Question

which is the most primitive algae? (a) red algae (b)blue-green algae (c) green algae (d) brown algae

Answer 1

Here is your answer....
B) blue green algae

Answer 2

Your answer is blue green algae.

It is cyanobacteria of Kingdom Monera with phycocyanin pogment in them. They have several prokaryotic features which make them primitive algae.