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Blake gives piano lessons in the evenings. he earns $20 for each piano lesson and has between 0 and 6 lessons each evening. the amount he earns in an evening depends on the number of lessons he gives. What is the range of this relation?

a. {0, 1, 2, 3, 4, 5, 6}
b. 0 ≤ y ≤ 120
c. 0 ≤ y ≤ 6
d. {0, 20, 40, 60, 80, 100, 120}