The correct answer is SQL.

The statement uses the SELECT and FROM keywords which are characteristic of the SQL query language for relational databases. It retrieves specific columns from a table named Clients and that structure matches standard SQL query syntax.

JSON is a data interchange format for representing structured data and it is not a query language. The example is not written in JSON.

BigQuery is a Google Cloud data warehouse service that runs queries but it is not the query language itself. BigQuery accepts queries written in SQL so the example is SQL syntax rather than a BigQuery language.

Python is a general purpose programming language and the shown statement is not valid Python syntax. Python would require different syntax and would not use raw SQL keywords in this way without a database interface.

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