A fall in demand is enough to demonstrate that consumers have forgotten about the product and moved on to other products.

has forgot about the product
had forgotten of the product
have forgotten about the product
has forgotten for the product

Correct answer: have forgotten about the product

Solution

The subject 'consumers' is plural, so the correct auxiliary is 'have' rather than 'has'. The phrase 'forgotten about the product' is also the correct idiomatic form. Therefore, 'have forgotten about the product' is correct.

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