Final answer:
ATP helps move substances into cells through active transport, providing energy for protein carriers in the cell membrane to pump substances against their concentration gradient. So the correct option is d.
Step-by-step explanation:
The question addresses how ATP assists in moving substances into cells. The correct answer is through active transport. ATP (adenosine triphosphate) provides the necessary energy for active transport, which involves the movement of substances against their concentration gradient and requires the involvement of specific protein carriers within the cell membrane. Unlike osmosis, filtration, and diffusion, which are passive processes not requiring energy, active transport allows cells to accumulate substances in higher concentrations internally than exist in the external environment. Through the active transport process, membrane proteins act as 'pumps' and use energy derived from ATP to move substances across the cell membrane from a region of lower concentration to a region of higher concentration.