Verified Answer :

I believe your best answer would be the third option, both sexually and asexually. Some types of algae reproduce asexually due to the division of one cell into two or even more brand new cells that are genetically similar to the parent cell. However, other types of algae participate in sexual multi-cell reproductive cycles. 
I hope this has answered your question and I do apologise if I am wrong. Good luck on your assignment :)

Answer:

C

Explanation:

Different species of green algae are known to reproduce by fission, fragmentation, and other methods

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