SQL is particularly effective in managing and querying which of the following?

SQL, or Structured Query Language, is specifically designed to manage and manipulate data held in relational databases. It provides a standardized way to perform tasks such as querying data, updating records, inserting new data, and deleting data.

Relational databases organize data into structured tables that can be easily accessed and modified using SQL commands. This capability is crucial for handling large volumes of data efficiently, enabling complex queries that can extract meaningful information from interconnected datasets.

In contrast, web pages, spreadsheets, and graphic images are not primarily managed through SQL. Web pages are often constructed using HTML, CSS, and JavaScript, while spreadsheets commonly utilize tools like Excel or Google Sheets, which have their own set of functions for data manipulation. Graphic images are typically managed through specialized software designed for image editing and rendering, not through a query language like SQL. Therefore, the effectiveness of SQL is uniquely suited to the realm of databases, making it the correct choice in this context.