Which are the most primitive types of organisms?

Which of the following is a characteristic of the domain $Archaea$?

Select the incorrect statement regarding conjugation.

Assertion: Chemosynthesis is an autotrophic nutrition.
Reason: Chemoautotrophs contain chlorophyll pigments.

Consider the following four statements $(A-D)$ and select the option which includes all the correct ones only.
$(A)$ Archaebacteria differ from other bacteria in having a different cell wall structure.
$(B)$ Bacteria as a group show the most extensive metabolic diversity.
$(C)$ All Eubacteria have chlorophyll ' $a$' pigment similar to green plants.
$(D)$ Mycoplasma can survive without oxygen.

In which kingdom is $Methylophilus$ $methylotrophus$ classified?