Which of the following is a fundamental physical quantity?

1. Speed

2. Length

3. Area

4. Acceleration

The correct option is B

Length

1. Fundamental physical quantities are those which do not depend on other quantities.
2. There are seven fundamental physical quantities - length, mass, time, temperature, current, quantity of substance and luminous intensity.
3. Area, speed and acceleration are examples of derived physical quantities.

Hence, (b) is the correct option.