**Core Concept**
Vitamin K-dependent clotting factors are a group of proteins crucial for blood coagulation. These factors require the presence of vitamin K to undergo gamma-carboxylation, a post-translational modification necessary for their function. This process allows them to bind calcium ions and interact with phospholipid surfaces, facilitating the coagulation cascade.

**Why the Correct Answer is Right**
The correct answer involves factors II (prothrombin), VII, IX, and X, as well as proteins C and S. These proteins are all dependent on vitamin K for their gamma-carboxylation, which enables them to bind calcium ions and participate in the coagulation cascade. The gamma-carboxylation process involves the enzyme vitamin K epoxide reductase, which is essential for the recycling of vitamin K. This process is crucial for the proper functioning of these clotting factors and the prevention of bleeding disorders.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify which clotting factor is vitamin K-dependent. While factor VIII is a crucial clotting factor, it is not dependent on vitamin K.
**Option B:** This option is not correct because it is incomplete and does not specify which clotting factors are vitamin K-dependent.
**Option C:** This option is incorrect because it is incomplete and does not specify which clotting factors are vitamin K-dependent.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that vitamin K-dependent clotting factors are also dependent on the presence of calcium ions for their proper functioning. A deficiency in either vitamin K or calcium can lead to bleeding disorders.

**Correct Answer: D. Factors II, VII, IX, and X, as well as proteins C and S.**