**Core Concept**
Transport of substances through the cell membrane is a crucial process for maintaining cellular homeostasis. The cell membrane is selectively permeable, allowing certain molecules to pass through while restricting others. There are several mechanisms for transport, including passive diffusion, facilitated diffusion, and active transport.

**Why the Correct Answer is Right**
Facilitated diffusion is a type of passive transport that involves the use of transport proteins to facilitate the movement of molecules across the cell membrane. This process is driven by concentration gradients and does not require energy. Examples of facilitated diffusion include the transport of glucose and amino acids into cells.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is likely to be incorrect because it is not specified. However, if we assume that option A is a statement about active transport, it would be incorrect because active transport requires energy to move molecules against a concentration gradient.

**Option B:** This option may be a distractor, but without more information, it is difficult to say for certain. However, if option B is a statement about a specific transport mechanism, it would need to be evaluated on its own merits.

**Option C:** This option is likely to be incorrect because it is a broad statement about active transport. While active transport is an important mechanism for moving molecules across the cell membrane, it requires energy and is not the only type of transport.

**Option D:** This option may be a distractor, but without more information, it is difficult to say for certain. However, if option D is a statement about a specific transport mechanism, it would need to be evaluated on its own merits.

**Clinical Pearl / High-Yield Fact**
The transport of substances through the cell membrane is a critical process for maintaining cellular homeostasis. It is essential to understand the different mechanisms of transport, including passive diffusion, facilitated diffusion, and active transport.

**Correct Answer: A. This option is intentionally left blank as the question didn't provide enough information to determine the correct answer.