In the following passage some words have been deleted. Fill in the blanks with the help of the alternatives given. Select the most appropriate option for each blank.

Comprehension:
Students of marketing know that the term Unique Selling Proposition, or USP was developed in the 1940s in the United States. USP is (1) ______ as the true value (2) ______ a firm. At the core of (3) ______ successful business, there is (4) ______ a value proposition, something (5) ______ promoters and the managers are proud of.