Correct Answer: (D) Dhanurasana, Chakrasana, Bhujangasana

Step 1 - What kyphosis is:

Kyphosis is an exaggerated outward or backward curve of the upper back, commonly called round upper back or hunch back.

Step 2 - What kind of exercise corrects it:

Since the upper back is bent forward, the correction must come from backward bending or back extension movements, which stretch the chest and strengthen the back muscles.

Step 3 - Check the asanas:

Dhanurasana (bow pose), Chakrasana (wheel pose) and Bhujangasana (cobra pose) are all backward bending asanas, so all three help in correcting kyphosis. Ustrasana is another such asana.

Step 4 - Why the others are wrong:

Halasana and Adhomukhasana are forward bending asanas, which would increase the round back. Trikonasana is a sideways bending asana and is used for scoliosis.

Hence, option (D) is correct.