Line conventions............lines can only be thick or thin. Thick is 0.6mm and thin is 0.3mm.
I think that the answer is C.
The title of this example of art is Sarcophagus of the church of Santa Maria Antiqua.
It does contain Christian symbolism that was unrecognizable by pagans. It was also possibly made to be the tomb of a rich Christian living in the third century. It was made in 275 CE and contains the representations of many Biblical and non-biblical people.