"He became a politician."--- Here the word "politician" is used as ---
"He became a politician."--- Here the word "politician" is used as --- Correct Answer complement
Verb এর অর্থ সম্পূর্ণ করতে verb. এর পর যে word ব্যবহৃত হয় তা complement. প্রশ্নোক্ত বাক্যে became এর complement হলো a politician.