Which of the following reactions give $\mathrm{H}_2$ as one of the products? (Reactions are not balanced) I) $\mathrm{NaBH}_4+\mathrm{I}_2 \longrightarrow$ II) $\mathrm{B}_2 \mathrm{H}_6+\mathrm{N}\left(\mathrm{CH}_3\right)_3 \longrightarrow$ III) $\mathrm{A} l+\mathrm{NaOH}+\mathrm{H}_2 \mathrm{O} \longrightarrow$ IV) $\mathrm{BF}_3+\mathrm{NaH} \longrightarrow$

• A

  I, II & III only
• B

  II & IV only
• Correct answer
  C

  I & III only
• D

  II, III & IV only

Hence, the correct answer is option: 'C'.