The Sea Slug Elysia Chlorotica Absorbs Chloroplasts from the Alga

The sea slug Elysia chlorotica absorbs chloroplasts from the alga Vaucheria litorea as it digests the cells.Thousands of structure and transport proteins involved in photosynthesis require thousands of genes in DNA.The algal chloroplast contains only 10% of the genes,while the algal nucleus contains the rest.Chloroplasts function inside the sea slug,allowing it to live on sunlight and carbon dioxide,suggesting that

A) photosynthesis can occur outside of a chloroplast organelle found in algae.
B) chloroplasts alone are sufficient for photosynthesis, whether in algal cells or sea slug cells.
C) regions of DNA containing necessary genes for photosynthesis must be present in sea slug cells to retain functioning chloroplasts.
D) some of the algal cells are not digested and are living symbiotically inside digestive tract of the sea slugs.
E) algal genes controlling photosynthesis can produce necessary proteins prior to cell digestion, retaining function of the chloroplast.