In such a case, can claim 1 be amended to include the element C in response to the 1st OA ?
Note that the specification describes the device can includes the element A, B, C.
You should be able to amend claim 1 to recite ABC, but the examiner may resist. I'd suggest pointing out where your specification describes that combination in your remarks.
Device ABC would not fit into either of the species identified by the examiner. It is possible that the examiner may take the position that you should have traversed the election of species.