The ratio of the dimension of Planck's constant and that of moment of inertia is the dimension of

Consider the following statements:
$(A)$ Any physical quantity can have more than one unit.
$(B)$ Any physical quantity has only one dimensional formula.
$(C)$ More than one physical quantity may have the same dimension.
$(D)$ We can add and subtract only those expressions that have the same dimension.
The number of correct statements is:

To determine Young's modulus of a wire,the formula is $Y = \frac{F}{A} \cdot \frac{L}{\Delta L}$,where $F/A$ is the stress and $L/\Delta L$ is the reciprocal of strain. The conversion factor to change $Y$ from $CGS$ to $MKS$ system is:

The dimensions of pressure are equal to

Pick out the two scalar quantities in the following list:
force,angular momentum,work,current,linear momentum,electric field,average velocity,magnetic moment,relative velocity.

Identify the pair of physical quantities which have different dimensions.