it is number 4. the last one at the bottom.
The vault was ornamented with coffers. Some triumphal arches were surmounted by a statue or a currus triumphalis, a group of statues depicting the emperor or general in a quadriga. The inscriptions on Roman triumphal arches were works of art in themselves, with very finely cut, sometimes gilded letters.
I am pretty sure it A. and B. Hope this Helps:)
