The question asks about the function of Snowflake's virtual warehouses. Virtual warehouses in Snowflake are compute clusters that handle query execution - they process SQL queries by scanning data from the storage layer and returning results. The community discussion shows 100% consensus on option C with multiple users confirming 'C is correct' and 'C. Query execution' with upvotes supporting this answer. Other options are incorrect: Infrastructure management (A) is handled by Snowflake's cloud services layer, metadata management (B) is also a cloud services function, query parsing and optimization (D) occurs before execution in the cloud services layer, and management of the storage layer (E) is separate from compute operations.