Improve the underlined part of the sentence. Choose 'No improvement' as an answer if the sentence is grammatically correct.

People who came into contact with the carrier are in danger of catching the disease.

The correct answer is 'Option 2' i.e. 'No improvement'.

Key Points

• The phrase "in danger of" is the correct and idiomatic way to express the idea of being at risk or susceptible to something harmful or dangerous.
• It is used appropriately in the given sentence to convey that people who came into contact with the carrier are at risk of catching the disease.

Therefore, the correct sentence is: 'People who came into contact with the carrier are in danger of catching the disease.'

Additional Information

• Now let's examine why the other options are incorrect:
• At dangerous of: This option is incorrect because "at dangerous of" is not a correct phrase. 
• In danger off: This option is incorrect because it adds an unnecessary extra "f" at the end of "danger."
• In dangers for: "Dangers for" suggests that people are causing the dangers, whereas the original sentence implies that people are at risk of catching the disease. The original phrase "in danger of" should be retained.