$A$ block with a square base measuring $a \times a$ and height $h$ is placed on an inclined plane. The coefficient of friction is $\mu$. The angle of inclination $(\theta)$ of the plane is gradually increased. The block will:

• A
  topple before sliding if $\mu > \frac{a}{h}$
• B
  slide before toppling if $\mu < \frac{a}{h}$
• C
  slide before toppling if $\mu < \frac{a}{h}$
• D
  Both $(A)$ and $(C)$