Conjugation phenomenon of sexual reproduction is seen in

The correct option is C

Both (a) and (b)

Conjugation is the transfer of genetic material between bacterial cells by direct cell-to-cell contact or by a bridge-like connection between two cells. Conjugation as a mode of sexual reproduction is seen in bacteria and some ciliated protozoa. E.coli is an example of bacteria and paramecium is an example of protozoa exhibiting conjugation.