The correct option is
A B-cells are fused with myeloma cells
In hybridoma technology antibody producing B cells are fused with myeloma cells. These hybrid cells therefore acquire the capability to generate antibodies and also have the ability to live on indefinitely as it is a hybrid of myeloma cell. Hence, they are able to generate a large number of monoclonal antibodies.
So, the correct answer is 'B-cells are fused with myeloma cells'