Oh yes, . . . . . . . . you away? A. is B. was C. am D. are

The correct answer is “were.”

The sentence “Oh yes, were you away?” is in the past tense, because it is asking about something that happened in the past. The verb “to be” is conjugated as “were” in the past tense for the first person plural (we), the second person plural (you), and the third person plural (they).

The other options are incorrect because they are not conjugated in the past tense. The verb “to be” is conjugated as “is” in the present tense for the third person singular (he, she, it), and as “am” in the present tense for the first person singular (I).