Harry Tells You That He Prefers Irn- Bru^TM to Tango^TM

Harry tells you that he prefers Irn- bru^TM to Tango^TM, Tango^TM to Strongbow^TM and Strongbow^TM
To Irn- bru^TM. This violates what assumption made when analysing consumer preferences?

A) That consumers are able to choose among all the combinations of goods and services available
B) That there is a diminishing marginal rate of substitution
C) That consumers are rational
D) That more is better