The problem asks for the derivative $f'(x)$ of the function $f(x) = 2x - 5$.

To solve:

1. The derivative of $f(x) = 2x - 5$ is calculated using basic differentiation rules:
   • The derivative of $2x$ is $2$.
   • The derivative of the constant term $-5$ is $0$.

Thus, $f'(x) = 2$.

The correct answer is: A. 2

Would you like further explanation or details? Here are 5 related questions for practice:

1. What is the derivative of $f(x) = 3x + 4$?
2. How do you find the slope of a linear function from its derivative?
3. What does the derivative represent in the context of a graph?
4. If $g(x) = 5x^2 - 3x + 2$, what is $g'(x)$?
5. How do you apply the power rule for differentiation?

Tip: Always simplify the function before applying differentiation rules for easier calculations.