Which Endocytic Process is Best Depicted in the Following Schematic

Question

Which endocytic process is best depicted in the following schematic diagram? 
A) Receptor-mediated endocytosis 
B) Pinocytosis 
C) Macropinocytosis 
D) Phagocytosis 
E) Entosis

Accepted Answer

Macropinocytosis does not operate continually and is typically induced only in response to activation of cell-surface receptors by various stimuli. The ensuing activation of intracellular signaling pathways results in changes in actin dynamics and the formation of cell-surface protrusions known as ruffles, which then collapse to form macropinosomes.