Lithium aluminium hydride can be prepared from the reaction of

The strength of $50$ volume solution of hydrogen peroxide is _____ $\mathrm{g}/\mathrm{L}$ (Nearest integer).

Given:
Molar mass of ${\mathrm{H}}_2{\mathrm{O}}_2$ is $34 \mathrm{g} {\mathrm{mol}}^{-1}$
Molar volume of gas at $\mathrm{STP}=22.7 \mathrm{L}$.

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R 

Assertion A: Hydrogen is an environment friendly fuel.

Reason R: Atomic number of hydrogen is $1$ and it is a very light element.
In the light of the above statements, choose the correct answer from the options given below