Given the question: Read the following article and select the best answer. Article: During her sixty-year career performing, Lena Horne entertained people with her beauty and rich, emotional voice. She used her fame to fight social injustices toward African-Americans. Lena Horne was born in New York in 1917. At sixteen, Lena became a dancer at the famous Club in New York City. After taking voice lessons, she soon became a singer. In 1940, Lena Horne became the first African-American to perform with an all-white jazz band. After performing at a club in Hollywood, California, she caught the attention of filmmakers. She soon began making movies. Her films became very popular. In the 1940's, Lena Horne was the first African-American in Hollywood to sign a long-term contract with a major movie studio. Her deal with MGM stated that she would never play the role of a servant. She refused to play roles that represented African-Americans disrespectfully . But this refusal also limited her movie career. Lena Horne once said that World War Two helped make her a star. She was popular with both black and white soldiers. She sang on army radio programs and traveled to perform for the troops. Once, she noted that German prisoners of war were permitted to sit closer to the stage than black soldiers. She was very angry. These experiences led to Lena Horne's work in the civil rights movement. Lena Horne sang at civil rights gatherings. She took part in the March on Washington protest in 1963. It was during this event that Martin Luther King Junior gave his "I Have a Dream" speech. She protested racial separation at the hotels where she performed. She took action so that she and her musicians would be allowed to stay in those hotels. Black musicians at the time generally stayed in black neighborhoods. Lena Horne died in New York in 2010. Question: Why was Lena Horne angry? - Because she was ill-treated by the army. - Because black soldiers were badly treated by the army. - Because she was refused to perform together with white actors. - Because white soldiers insulted her.
The answer is:
Because black soldiers were badly treated by the army.