According to IUPAC system, the correct name of the compound having the formula

• A

  2 -ethyl-3-methyl but- 1 -ene
• B

  2 -methyl pent- 3 -ene
• C

  2 -methyl but- 1 -ene
• Correct answer
  D

  None of these

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