Answer and Explanation:
I will provide you with a sentence for each rule so that you can choose the one you think is best.
Rule 1: drop the "e". Dance --> danced; smile --> smiling; like --> likable. There is no need to keep the final "e" when adding a suffix that begins with a vowel.
Sentence: The way she was smiling while she danced made her look more likable.
Rule 2: double up. Tip --> tipped; admit -> admitted. When the word ends consonant +vowel +consonant, we must double the final consonant before adding the suffix. That is true for monosyllabic words as well as words that have two syllables, the last syllable being stressed.
Sentence: The waiter admitted he had forgotten our order, but we still tipped him for his honesty.
Rule 3: don't double up. Travel --> traveler; cheat --> cheated. There is no need to double the final consonant in other cases. If the word has one syllable but does not end in CVC, or if it has two syllable but the first one is the stressed one, we should not double.
Sentence: A traveler who cannot understand the local language is often cheated by salespeople, and ends up paying more.