Who were the docetists? what follows from their false concept about jesus?

Docetist are religious group of people following the doctrine of Docetism (Dokētaí=illusionists), based on the phenomenon on Christ being both human and God. This particular doctrine denies Christ’s historical and bodily existence and claims it to be an illusion. Therefore, Docetist say that Christ didn’t repay for sins as he wasn’t even alive. Action and beliefs of Docetist have arisen concern over the figurative or literal meaning of sentence “The World was made of Flesh” (Gospel of Jon).

the answer might be either a or c. can't be too sure , because i searched the web, but no valid answers came through.

are there any options?