Read the following passage and write the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.

Some Russian women became well-known fighter pilots during the Second World War. Yekaterina Budanova was one of them. She joined the Soviet Army and became a lighter pilot after working as a non-military pilot. At first, Budanova's officer didn't believe in her ability. But in a short time, Budanova became famous for her talent and remarkable flying skills. Unfortunately, she died at the age of 26 in air-to-air fighting against German planes although she already shot down one plane and hit a second before being shot down herself.

Interested in flying at an early age, Lydia Litvyak joined a flying club and performed her first solo flight at the age of 15. She became a fight instructor after graduating from the military flying school. After the German attack on the Soviet Union in 1941, Litvyak joined the Soviet Air Force and soon achieved great success. Like Budanova, she was killed (at the age of 21) in fighting against German planes. And along with Yekaterina Budanova, Lydia Litvyak is often considered one of the world's most famous female fighter pilots.

A. technical B. experience C. experiment D. gender