Which situation represents a proportional relationship? A The cost of hiring a plumber for $30 per hour with a service charge of $80 B The cost of hiring a painter for $35 per hour plus the cost of materials C The cost of hiring a lawn care team for $100 per hour plus a fuel fee of $10 per hour D The cost of hiring a mechanic for $40 per hour plus an additional charge for automotive parts Which statement describes the mapping?