The correct option is B Interleukins
An interleukin is a group of cytokines, that were first seen to be expressed by the WBCs. The majority of the interleukins are synthesized by helper CD4 T lymphocytes, as well as through monocytes, macrophages, and endothelial cells. They promote the development and differentiation of T and B lymphocytes and hematopoietic cells.
Interferons are a group of signaling proteins made and released by host cells in response to the presence of pathogens,
So, the correct answer is option B.