Based on the given information, for 1 hour the cost is $9, for additional hours each hour cost $4. For example, for 2 hours, the cost is $4 + $9 = $13 and for 3 hours is $4 + $4 + $9 = $17.
Based on the previous calculation, you can conclude that following expression represent the given situation.
C = 4(h - 1) + 9
Hence, the answer is option B.
