Which feature helps prevent unauthorized changes to worksheet data?

Here are the answers to the questions:

Question 1: Which feature helps prevent unauthorized changes?

• (A) AutoFill
• (B) Worksheet protection
• (C) Conditional formatting
• (D) Cell alignment

The feature that helps prevent unauthorized changes to a spreadsheet is Worksheet protection. It allows users to lock cells, prevent formula changes, and restrict other modifications.

The correct answer is $\boxed{\text{(B) Worksheet protection}}$.

Question 2: The primary purpose of a pivot table is to:

• (A) edit raw data directly
• (B) encrypt spreadsheet files
• (C) summarize and analyze large
• (D) design charts only

The primary purpose of a pivot table is to summarize and analyze large datasets. It allows users to quickly group, count, and sum data to gain insights.

The correct answer is $\boxed{\text{(C) summarize and analyze large}}$.