<span>The following best describes a vocabulary system called Word Forms:
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B. Learn how a root word changes when used as a noun, verb, adjective, or adverb to learn multiple related words at the same time.
Answer: B. Dinner was the most delicious thing.
Explanation:
We should note that a comparative adjective is used when one wants to make comparison between two things while a superlative adjective is used when one wants to make comparison between three things or more.
In this case, the superlative of delicious is "most delicious". Therefore, the correct answer will be option B "Dinner was the most delicious thing.
I think your answer is A.