Adaeze bought a tin of powdered milk labelled as containing 900g but discovered on weighing that it contained only 750g. This practice by the manufacturer is best described as

Providing a label that misrepresents the quantity, quality, or composition of a product constitutes a false trade description. In this case, the label falsely states 900g when the actual content is 750g, thereby deceiving the consumer. Adulteration refers to mixing inferior substances into a product, which is a different offence.