The IUPAC name of

• A

  4-hydroxy-1-methylpentanal
• Correct answer
  B

  4-hydroxy-2-methylpent-2-en-1-al
• C

  2-hydroxy-4-methylpent-3-en-5-al
• D

  2-hydroxy-3-methylpent-2-en-5-al

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