Choice A is the correct answer. Use slope formula.

1. Substitute: $2 = \frac{10 - k}{5 - 2}$.
2. Simplify: $2 = \frac{10 - k}{3}$.
3. Solve: $6 = 10 - k \rightarrow k = 4$.

💡 Strategic Tip: You can also work backwards: If slope is 2, going back 3 steps in x (5 to 2) means going back 6 steps in y (10 to 4).

Choice B is incorrect.Choice C is incorrect.Choice D is incorrect.