‘I worked as a waiter before becoming a chef,’ he said.

Question:

“I worked as a waiter before becoming a chef,” he said.

• 
  A.
  He said I had worked as a waiter before becoming a chef.
• 
  B.
  He said he’d worked as a waiter before becoming a chef.
• 
  C.
  He said he worked as a waiter before becoming a chef.
• 
  D.
  He said I worked as a waiter before becoming a chef.