Jalen combines two substances in science class. Once combined, only one of the two substances is visible. When he placed this combination into a filter substance 1 stayed in the filter whilesubstance 2 went through it. Which of the following claims regarding Jalen's combination is the
most accurate?

a. This combination is not a mixture because he cannot see one of the substances

b. The combination is a mixture because the substances can be separated

c. The combination is not a mixture because the substances can be separated

d. The combination is a mixture only because he cannot see one of the substances