The correct answer is C. Person who buys or agrees to buy goods.
Section 2(1) of the Sale of Goods Act defines a buyer as “a person who buys or agrees to buy goods.” This definition is broad enough to include both individuals and businesses. It also includes both present and future buyers.
Option A is incorrect because it only includes persons who buy goods. Option B is incorrect because it only includes persons who agree to buy goods. Option D is incorrect because it includes both goods and services, while the definition of a buyer under the Sale of Goods Act only includes goods.