To answer this question, you need to understand the meaning of the given options. Let's go through each option to understand why it is correct or incorrect:
Option A) Armchair critic - This option is correct because an "armchair critic" refers to someone who provides advice or criticism based on theory or speculation, without practical experience or firsthand knowledge.
Option B) Swing critic - This option is incorrect. "Swing critic" is not a commonly used phrase or expression, and it does not convey the meaning of someone giving advice based on theory rather than practice.
Option C) Ladder critic - This option is incorrect. "Ladder critic" is not a commonly used phrase or expression, and it does not convey the meaning of someone giving advice based on theory rather than practice.
Option D) Textbook critic - This option is incorrect. While a "textbook critic" may refer to someone who critiques or analyzes textbooks, it does not specifically convey the meaning of someone giving advice based on theory rather than practice.
The correct answer is A) Armchair critic. This option is correct because it accurately describes someone who provides advice based on theory rather than practice.