Insufficient information for me to decide. Leaning A, but small chance of B.
There is no proof that Assad used chemical weapons. The only “proof” comes from the same swamp that Trump said he was going to drain. Even if there were proof, Trump promised that we would no longer be the world’s policeman.
Many here seem to forget that one of the worst gas attacks in modern history involved the Branch Davidians at Waco. The perpetrators were never punished, and no foreign country launched a missile attack against those responsible. But I guess the official policy is that we are OK with WMD attacks against Christians. Our own missile attack against Assad arguably helps ISIS, who also target Christians. Bottom line, protection of Christians is not a priority for the political establishment, and many in this forum seem to be perfectly OK with that.