Choose the letter A, B, C, or D to indicate the sentence that is combined from two following sentences.

Jack went to Ha Noi. He wanted to see Ho Chi Minh's Mausoleum and Hoan Kiem Lake.

David wondered if there are any active volcanoes in Europe.

David informed me that there are active volcanoes in Europe.

David asked whether there were active volcanoes in Europe.

David wants to know whether there were any active volcanoes in Europe.

Sarah asked if Vietnam has Ha Long Bay.

Sarah said that Ha Long Bay was in Vietnam.

Sarah asks whether Ha Long Bay is in Vietnam.

Sarah asks whether Ha Long Bay belongs to Vietnam.

John asked if the Northern Lights appeared all year round.

John asked if the best time to see the Northern Lights was winter.

John wanted to know if the Northern Lights were dangerous.

John wondered if he knew when the Northern Lights appeared.

Sarah wondered if the Great Barrier Reef was safe to swim in.

Sarah required me to swim in the Great Barrier Reef.

Sarah asked if I could swim in the Great Barrier Reef.

Sarah wanted to know if she could swim in the Great Barrier Reef.

The teacher asked were there any active volcanoes in Hawaii.

The teacher explained that volcanoes could erupt in Hawaii.

The teacher asked if there were any active volcanoes in Hawaii.

The teacher asked to know the location of the volcanoes in Hawaii.

He is the only person to answer all questions about President Ho Chi Minh.

He is the only person answered all questions about President Ho Chi Minh.

He was the only person to answer all questions about President Ho Chi Minh.

He is the only person answering all questions about President Ho Chi Minh.

My friend has booked a plane ticket to Hue to see monuments.

My friend has booked a plane ticket to Hue seeing monuments.

My friend has booked a plane ticket to Hue seen monuments there.

My friend has booked a plane ticket to Hue and seen monuments there.