Which one of the following shows isogamy with non-flagellated gametes?

Q. Which one of the following shows isogamy with non-flagellated gametes?
A. Sargassum
B. Ectocarpus
C. Ulothrix
D. Spirogyra
Answer: Spirogyra

A. Sargassum
B. Ectocarpus
C. Ulothrix
D. Spirogyra
Answer: Spirogyra