Which word is most appropriate to first introduce the verb inflection -ed?

To effectively introduce the verb inflection -ed, "camped" is the most appropriate choice because it exemplifies a one-syllable, regular verb that follows the standard rule for forming the past tense. By focusing on a word that clearly demonstrates the addition of -ed, students can easily grasp the concept of regular verb inflection.

In this case, "camped" is straightforward and easy to understand, as it builds off the base verb "camp" with the simple addition of -ed, leading to "camped." This clarity helps to solidify understanding of past tense formation among learners.

The other words presented may complicate the introduction of this inflection due to their contexts or less transparent syllabic structure, making them less ideal for foundational teaching moments focused on the -ed inflection. Thus, choosing "camped" allows for a clean and easy understanding of the concept without additional confusion.