Data Manipulation Language (DML) is a subset of SQL used to manage data within database objects like tables. The primary DML statements are INSERT, UPDATE, DELETE, and MERGE. The INSERT statement is used to add new rows of data into a table, which is a core data manipulation operation. Therefore, INSERT is a classic example of a DML statement. The other options relate to defining or managing the structure of database objects, not the data within them.

B. DISABLE: This is part of a Data Definition Language (DDL) command, typically used with ALTER TABLE to disable constraints or triggers, thus modifying an object's definition.

C. ALTER: This is a Data Definition Language (DDL) statement used to modify the structure of existing database objects, such as adding a column to a table.

D. DROP: This is a Data Definition Language (DDL) statement used to permanently delete database objects, such as tables, views, or indexes from the database.

1. Microsoft Learn. "Explore data manipulation." DP-900: Explore fundamental relational data concepts in Azure, Module 2, Unit 3. Microsoft. Accessed May 20, 2024. This module explicitly defines DML and lists INSERT, UPDATE, and DELETE as the primary statements for manipulating data.

2. Microsoft Learn. "Data Manipulation Language (DML) Statements (Transact-SQL)." Transact-SQL reference (Database Engine). Microsoft. Accessed May 20, 2024. This official documentation lists INSERT as a fundamental DML statement used to add one or more new rows to a table or view.

3. Microsoft Learn. "Data Definition Language (DDL) Statements (Transact-SQL)." Transact-SQL reference (Database Engine). Microsoft. Accessed May 20, 2024. This document categorizes ALTER and DROP as DDL statements, which are used to create, modify, and remove database objects.