Correct Answer: fatal

Solution : The correct choice is the fourth option .

In the sentence provided, the word deadly describes the severity of the disease. It implies that the disease is extremely harmful, potentially resulting in death. The synonym for "deadly" in this context is fatal.

The meanings of the other words are:

• Huge : This refers to something extremely large in size or extent. It indicates something immense or massive.
• Corrective : This relates to the action of rectifying something. It implies the act of making a correction or addressing an issue.
• Kind : This refers to showing benevolence, compassion, or being friendly and considerate towards others.

Therefore, the right answer is fatal .