Which incident fueled the Red Scare across the United States in the 1920s? A. A bomb sent by an anarchist group exploded in the Oklahoma state senate, killing four legislators. B. Postal workers discovered bombs in the mail meant for distribution to wealthy Americans and political officials. C. Several congressional leaders became sickened by a poison gas introduced into the US House of Representatives. D. The German navy sunk the Lusitania, a ship carrying more than 100 Americans. Please select the best answer from the choices provided A B C D