Alex and Felicia each have cats as pets. Alex buys cat food in cylindrical cans that are 6 cm in diameter and 12 cm high. Felicia buys cat food in cylindrical cans that are 12 cm in diameter and 6 cm high. What is the ratio of the volume of one of Alex\textquotesingle s cans to the volume of one of Felicia\textquotesingle s cans? (2019 AMC 8, 9) 
选项为:A:$1:4$  B:$1:2$  C:$1:1$  D:$2:1$  E:$4:1$  请回答其中一个选项.