A student scored 78 and 92 on his first two quizzes. Use the compound inequality to find the possible values for a third quiz score that would give him an average between 80 and 85.

a: 78 ≤ x ≤ 92
b: 75 ≤ x ≤ 85
c: 70 ≤ x ≤ 85
d: 80 ≤ x ≤ 85