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Which of the following spelling rules is incorrect?

A) One-syllable words ending in single vowel + single consonant double the consonant before a suffix beginning with a vowel.

B) Words of two or three syllables ending in single vowel + single consonant double the final consonant if the last syllable is stressed.

C) Words ending with silent e drop the e before a suffix beginning with a vowel.

D) If the word to which suffix ful is added ends in II, the second I is dropped.

E) None of these