Step 1: Understanding the Concept:
This question tests knowledge of a common English idiom and the spelling of homophones.
Step 2: Detailed Explanation:
The phrase "\_\_\_\_\_\_\_\_\_ and hearty" is a well-known idiom.
- The correct idiom is "hale and hearty", which means strong and healthy.
- hail: refers to frozen rain or a greeting.
- heal: means to become sound or healthy again.
- head: refers to the top part of the body.
The only word that fits the idiom is "hale".
The complete sentence is: "Ramesh is hale and hearty."
Step 3: Final Answer:
The correct option is (A) because "hale and hearty" is the correct idiom for being in good health.