Which situation represents a proportional relationship? A) The cost of a taxi cab ride of $2.00 per mile with an initial fee of $3.00. B) The height of a tree that grows 1 foot a month with a starting height of 4 feet. C) The number of pounds of dirt in a wheelbarrow with each 5 pound shoveled scoop of dirt. D) The cost of a gym membership with a cost of $22.00 per month and a one time sign-up fee of $50.00.