The city hall of a certain city launched a campaign that allows exchanging four 1-liter empty bottles for one 1-liter full bottle of milk. How many liters of milk can a person obtain who has 43 empty 1-liter bottles by making several of these exchanges?
(a) 11
(b) 12
(c) 13
(d) 14
(e) 15
The correct option is (d).

Since $43=10 \times 4+3$, in the first round, the 43 empty bottles can be exchanged for 10 full bottles, leaving 3 empty bottles. Now, after consuming the milk from these 10 bottles, we have 13 empty bottles, which can be exchanged for 3 full bottles, leaving 1 empty bottle. Finally, after consuming the milk from these 3 full bottles, we have 4 empty bottles, which can be exchanged for 1 full bottle. Therefore, the total number of full milk bottles that can be obtained in this process is $10+3+1=14$.