Q: Select the correct indirect form of the given sentence.Bhola said to his mother, "Why is this charcoal so black?"

• A. Bhola asked his mother why was that charcoal so black.
• B. Bhola told his mother why that charcoal was so black.
• C. Bhola asked his mother why that charcoal was so black.
• D. Bhola asked his mother why this charcoal is so black.