Blood is thicker than water is a proverb in English meaning that familial bonds will always be stronger than other relationships.

The phrase “Dear friend” is a vocative, which is a word or phrase that is used to address someone directly. In English, vocatives are typically followed by a comma. So the answer is (b), “,”.

The word “cynosure” translates to “مشہور شخصیت” (mashhoor shakhsiyat) or “مرکز توجہ” (markaz-e-tawajah). It refers to a person or thing that is the center of attention or the focus of everyone’s gaze.