After two hours of continuous work, the group broke … lunch.

Analyze the question: The sentence is "After two hours of continuous work, the group broke ..... lunch." We need the preposition that correctly follows the phrasal verb "broke."

Explain the concept: The verb phrase "break for" means to stop an activity for a short rest or a meal. For example:

• "The class broke for recess."
• "The committee broke for tea."

Compare the other options:

• "break with" means to end a relationship or tradition (e.g., "He broke with his old friends").
• "break from" means to separate from something or escape (e.g., "The prisoner broke from custody"). It does not fit when the following word is the purpose of the pause.
• "break to lunch" is not an accepted English construction.

Solution:

1. The group had worked for two hours without stopping.
2. They then paused their work for the purpose of eating lunch.
3. "Break for" is the idiom that expresses stopping for a meal or rest.

The sentence reads correctly: "After two hours of continuous work, the group broke for lunch."

Answer: The correct option is C. for.

Tip: When you see "break" followed by a meal or rest (lunch, tea, recess, the weekend), think "break for." Remember it as "We break FOR food." Also remember that "break with" is about ending ties, while "break from" is about separating or escaping.