Let us evaluate the dimensional formula for each physical quantity given in the options and compare it with $[M^a L^b T^c]$:

1. Pressure: Pressure = $\frac{\text{Force}}{\text{Area}} = \frac{[M L T^{-2}]}{[L^2]} = [M^1 L^{-1} T^{-2}]$. Comparing with $[M^a L^b T^c]$, we get $a=1, b=-1, c=-2$. This matches the first option perfectly.

2. Velocity: Velocity = $\frac{\text{Displacement}}{\text{Time}} = [L T^{-1}] = [M^0 L^1 T^{-1}]$. Here $a=0, b=1, c=-1$ (Mismatch with option 2).

3. Acceleration: Acceleration = $\frac{\text{Velocity}}{\text{Time}} = [L T^{-2}] = [M^0 L^1 T^{-2}]$. Here $a=0, b=1, c=-2$ (Mismatch with option 3).

4. Force: Force = Mass $\times$ Acceleration $= [M^1 L^1 T^{-2}]$. Here $a=1, b=1, c=-2$ (Mismatch with option 4).

Therefore, the correct physical quantity for the given dimensions is pressure.