C
Below is a question with multiple-choice answers. Choose the correct option based on your reasoning.

### Question:
Cell membranes are described as selectively permeable. Four students were asked to explain what this means and provided the answers given below.Student 1: Cell membranes prevent all materials from entering the cell.Student 2: Cell membranes only provide structural support for the cell.Student 3: Cell membranes regulate which substances can enter and exit the cell.Student 4: Cell membranes allow water and water-soluble substances to enter the cell.Which student correctly identified the function of the selectively permeable membrane?

### Choices:
A. Student 1
B. Student 2
C. Student 3
D. Student 4

### Answer:
