The word "gratitude" contains the root word "gratus" originated in Latin that means "pleasing," as expressed in option D and further explained below.
We can define a root word as a word that gives origin to other words as well as their basic meaning. Several words used in English actually originated from Latin or Greek root words.
That is the case with the word "gratitude." It originally comes from the Latin root "gratus," which means pleasing, welcome, or even thankful. Therefore, we can select option D as the correct answer.
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