Final Answer:
The method used to raise the butts of tiles in the starter course should allow for C) Proper drainage.
Step-by-step explanation:
In tile installation, the starter course is crucial for providing the base and ensuring the proper alignment of subsequent rows. The method employed for raising the butts of tiles in this course should prioritize proper drainage. Option C is the correct choice because allowing for proper drainage is essential to prevent water accumulation and potential damage. While options A and B may be considerations in certain contexts, the primary focus in the starter course is on maintaining effective drainage. Adequate drainage ensures that water does not pool beneath the tiles, promoting longevity and preventing issues such as water damage or mold growth.
Option C is the answer.