How many kinds of Bravais lattices are possible in crystal systems?

Match the crystal system/unit cells mentioned in Column $I$ with their characteristic features mentioned in Column $II$.

Column $I$	Column $II$
$(A)$ Simple cubic and face-centred cubic	$(p)$ have these cell parameters $a=b=c$ and $\alpha=\beta=\gamma=90^{\circ}$
$(B)$ Cubic and rhombohedral	$(q)$ are two crystal systems
$(C)$ Cubic and tetragonal	$(r)$ have only two crystallography angles of $90^{\circ}$
$(D)$ Hexagonal and monoclinic	$(s)$ belong to same crystal system

Which crystal system does diamond possess?

The crystal system with edge lengths $a \neq b \neq c$ and axial angles $\alpha = \beta = \gamma = 90^{\circ}$ is '$x$' and the number of Bravais lattices for it is '$y$'. $x$ and $y$ are:

The crystal system of a compound with unit cell dimensions $a = 0.387 \ nm$,$b = 0.387 \ nm$ and $c = 0.504 \ nm$ and $\alpha = \beta = 90^{\circ}$ and $\gamma = 120^{\circ}$ is:

Enlist the characteristics of a unit cell.