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Bandwagon.
Loaded Words.
Testimonial.
Name-Calling.
Plain Folks.
Snob Appeal.
Misuse of Statistics.
Transfer.
Hi there!☺
Your answer is going to be choice four, "<span>If a base word has only one syllable and ends in one consonant, double the final consonant."
Therefore, you get the correct variation: "dropped".
~Elisabeth</span>