Answer: Query processing

The correct answer is B (Query processing) because virtual warehouses in Snowflake are compute clusters that handle query execution and data processing operations. According to Snowflake's architecture documentation and the community consensus (100% agreement with upvoted comments), virtual warehouses belong to the query processing layer, which is responsible for executing SQL queries, DML operations, and other computational tasks. Option A (Cloud services) is incorrect as this layer handles coordination, authentication, and metadata management. Option C (Elastic memory) is not a recognized Snowflake layer. Option D (Database storage) is incorrect as this layer handles data persistence and is separate from compute resources.

Author: LeetQuiz Editorial Team