The correct answer is option B
A man has only one birthday. Every man is only born once and the day he is born is termed his “birthday”. No man can have 10, 2, 34 or 76 birthdays. We only celebrate this birthday once in a year not that we have more than one birthdays. Therefore, option A, C and D are incorrect.
To make this easier for you to understand, a man only has one birthday and every other celebration on this date is a birth anniversary.
Hope this helps.