Q:

The guide said to the tourists, "This will be the best day of your life."

• 1
  The guide told the tourists this that would be the best day of their lives.
• 2
  The guide told the tourists that this will be the best day of their lives.
• 3
  The guide told the tourists that this would be the best day of their lives.
• 4
  The guide told the tourists that that would be the best day of their lives.