Final answer:
All of the listed options, binary fission, mitosis, conjugation, and sexual reproduction, are modes of reproduction that protists use. Thus, All of these are modes of reproduction for protists.
Step-by-step explanation:
The question being asked refers to the modes of reproduction that a protist can utilize. Protists have a variety of mechanisms for reproduction, including binary fission, which is a form of asexual reproduction, and sexual reproduction methods that may involve meiosis and fertilization. In binary fission, one organism splits into two, while sexual reproduction involves the combination of genetic material to create diverse offspring. Other forms of asexual reproduction mentioned include budding and multiple fission.
However, based on the information provided and general knowledge of protist reproduction, all of the options listed (a. Binary fission, b. Mitosis, c. Conjugation, and d. Sexual reproduction) are indeed modes of reproduction that protists are known to employ. Therefore, the correct answer to the question would be e. All of these are modes of reproduction for protists.