Discussion

Explanation:

Statement A is incorrect because of a tense error. The correct sentence should be 'I forgot that they were coming today.'
Statement B is correct. When the subordinate clause starts with the conjunction “than”, any tense can be used in the subordinate clause- even if the principal clause uses the past tense.
Statement C is incorrect because of an error in parallelism. The adjective “challenging” should be balanced with an adjective 'inspiring' or the noun “inspiration” should be balanced with the noun 'challenge'.
Statement D is incorrect because of a prepositional error. The preposition “to” is erroneously used in this sentence. The correct sentence should be 'She is confident of speaking in English within six months' / 'She is confident of being able to speak in English within six months'.
Hence, the correct answer is option 2.

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