The verb being used in the given sentence above is the word "had contained". The tense of this verb is past perfect. Therefore, the correct answer would be option A. When a verb is in the past perfect, this indicates that the action has been completed some time in the past.
Do i agree with the ideas presented? do i think the writing is interesting? do i like the essay? do i see that the writer tried to add style to the essay do i notice that the writer tries to engage readers?