The active transport system involves the use of energy to move the molecules against a gradient. The secondary active transport uses the proteins to move the molecules. Thus, option C is correct.
Active transport is the movement of the molecules from an area of lower to a higher concentration that is against a gradient. The secondary type of active transport uses the coupling molecules.
The coupling molecules like proteins are used as carriers to move the molecules against the gradient in a semi-permeable environment. In the secondary active transport, the cotransporter moves the coupled molecules by two methods called symporter and antiporter.
Therefore, in option C. the molecules in an active transport move with the help of proteins.
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Your question is incomplete, but most probably your full question was, In active transport, molecules are moved across the cell membrane with the help of ___________.
