Amoebae move by crawling over a surface (pseudopodia), which involves a) growth of actin filaments to form bulges in the plasma membrane b) cilia c) reinforcing the pseudopod with intermediate filaments d) setting up microtubule extensions that vesicles can follow in the movement of cytoplasm

the answer is: A) growth of actin filaments to form bulges in the plasma membrane.

Explanation:

Amoebas are unicellular organism that can move on a surface using pseudopodia (false feet). This kind of movement is called amoeboid movement. The amoeboid movement is explained by the Sol-gel theory.  The protoplasm of the amoeba is made of an outer gelatinous layer, and an inner portion made up of plasma sol. The sol-gel theory explains the contraction and relaxation events in the protoplasm of the amoeba that lead to the pseudopodia.

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