Which of the following countries is well known for diamond cutting industry?

Answer: Option A

Belgium is well known for diamond cutting industry. Antwerp's diamond district, also known as the Diamond Quarter (Diamantkwartier), and dubbed the Square Mile, is an area within the city of Antwerp, Belgium. More than 80% of Antwerp's Jewish population works in the diamond trade; Yiddish was, historically, a main language of the diamond exchange.