Which of the following is correct?

Q. Which of the following is correct?

A.            All members of Sac fungus are also members of chemo-lithotrophic autotroph, but not all members of chemolithotrophic autotroph are members of Sac fungus.

B.            All members of chemolithotrophic autotroph are also members of Sac fungus, but not all members of Sac fungus are members of chemolithotrophic autotroph.

C.            All members of Sac fungus are members of chemolithotrophic autotroph, and all members of chemolithotrophic autotroph are members of Sac fungus.

D.            none of the above

Answer: All members of Sac fungus are members of chemolithotrophic autotroph, and all members of chemolithotrophic autotroph are members of Sac fungus.