The dance form that often includes elements of martial arts:

Changu
Kathak
Manipuri
Bharatnatyam

The correct answer is B) Kathak.

Kathak is a classical Indian dance form that originated in northern India. It is known for its intricate footwork, complex rhythms, and use of facial expressions and hand gestures. Kathak often includes elements of martial arts, such as swordplay and acrobatics.

Changu is a folk dance form from the Indian state of Manipur. It is characterized by its graceful movements and use of colorful costumes and headgear. Changu does not include any elements of martial arts.

Manipuri is a classical Indian dance form that originated in the Indian state of Manipur. It is known for its graceful movements and use of facial expressions and hand gestures. Manipuri does not include any elements of martial arts.

Bharatnatyam is a classical Indian dance form that originated in the Indian state of Tamil Nadu. It is known for its intricate footwork, complex rhythms, and use of facial expressions and hand gestures. Bharatnatyam does not include any elements of martial arts.