A car rental agency charges ₹ 200 per day plus ₹ 30 for each kilometre driven. Sara paid ₹ 450 for renting a car from them for one day. Which of the following linear equations could be used to find the number of kilometres she drove that day?
A30x + 200 = 450
B30x = 450
C30x = 50(200)
D450x + 50 = 30