Sentence B is incorrect because it uses 'bare' instead of 'bear'. 'Bear' refers to the animal, while 'bare' means without covering.
The student's question pertains to identifying the sentence with a homophone that is used incorrectly. Homophones are words that sound the same but have different meanings and often different spellings.
Looking at the sentences provided, the incorrect use of a homophone is in sentence B: 'The platform could not bear the weight of the grizzly bare.' The correct homophone should be 'bear' as in the animal, not 'bare' which means uncovered or without clothing.
'Bear' and 'bare' are often confused due to their identical pronunciation, which is why it's important to carefully consider the context in which they are used to ensure proper usage.