Which one of the following is representing the group of diatoms?

• A. Pinnularia, Navicula, Cymbella, Melosira
• B. Euglenamorpha, Hedneria , Heteronema, Colacium
• C. Nostoc, Anabaena, Aulosira, Cylindrospermum
• D. Cochlodinium, Gymnodinium, Lenodinium, Peridinium