What is the ratio of $\mathrm{sp}^3$ carbons to $\mathrm{sp}^2$ carbons in the product ' P ' of the given sequence of reactions?

• A

  $3: 1$
• B

  $2: 1$
• C

  $1: 2$
• Correct answer
  D

  $1: 3$

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