A) A-Gelidium, B-Vegetative cell, C-Heterocyst
B) A-Volvox, B-Somatic cell, C-Mucilaginous sheath
C) A-Chara, B-Mucilaginuous sheath, C-Heterocyst
D) A-Nostoc, B-Heterocyst, C-Mucilaginous sheath
Explanation
The correct answer is Option D: A-Nostoc, B-Heterocyst, C-Mucilaginous sheath.
A detailed explanation for this question is being prepared.