Density-Dependent Inhibition Is Explained by Which of the Following Processes

Multiple Choice

Density-dependent inhibition is explained by which of the following processes?

A) As cells become more numerous, they begin to squeeze against each other, restricting their size.
B) As cells become more numerous, the cell surface proteins of one cell contact the adjoining cells, and they signal each other to stop dividing.
C) As cells become more numerous, the protein kinases they produce begin to compete with each other, such that the proteins produced by one cell essentially cancel those produced by its neighbour.
D) As cells become more numerous, the level of waste products increases, which slows metabolism and inhibits growth.