The correct answer is A) They believed that internees should not help in the war effort because the internment of the Japanese was unjust.
Your question is incomplete. You did not include any reference to know what kind of opposition you are talking about. There is no reference, text, or context.
However, doing some research we can say that you are referring to Manzanar, a Japanese for Japanese-Americans in California during World War II.
So the full question must read: "Many internees at Manzanar objected to anyone who chose to work for the government by making war materials. Which statement most likely characterizes their opposition?"
So, the statement that most likely characterizes their opposition is
"They believed that internees should not help in the war effort because the internment of the Japanese was unjust."
The attack at Pearl Harbor increased the racial differences between Americans and Japanese people. President Roosevelt authorized the creation of military areas. The Japanese people that lived on the West Coast were removed from their homes. Japanese people living in that region were taken away by the military to seventeen internment centers such as fairgrounds and parks, located in Arizona, Oregon, Washington, and California. From then, they were moved again to other sites recently built. One of those was Manzanar Center, located in Owens Valley, California, where Many internees at Manzanar objected to anyone who chose to work for the government by making war materials.