Here's why:
* Condescending language implies a sense of superiority and looking down on someone. It often uses sarcasm or belittling language.
Let's break down each option:
* A) You forgot a comma. This is simply a statement of fact, lacking a condescending tone.
* B) Did a good job. This is a positive statement, though grammatically incorrect. It doesn't suggest looking down on someone.
* C) What were you thinking? This is a question that implies the person made a mistake or did something foolish. The tone is judgmental and suggests the speaker believes they know better.
* D) Give round applause for the class. This is a simple request, not inherently condescending.
Therefore, "What were you thinking?" is the only sentence that carries a condescending tone.