Correct option is A
Option (a) is incorrectly spelt word.
Correct spelling is: "Immigrate." (Hindi meaning: प्रवास करना)
Example: "Many people immigrate to other countries in search of better opportunities."
Meanings of all options:
· Immigrate: To come to live permanently in a foreign country.
· Combat: Fighting between armed forces.
· Relevant: Closely connected or appropriate to what is being done or considered.
· Professional: Relating to or connected with a profession.