Final answer:
The most appropriate text to complete the sentence is option D 'easier to learn', which uses the correct comparative form when comparing tap to ballet.
Step-by-step explanation:
The text that best completes the sentence "As a dancer, I studied tap and ballet. In my experience, tap was..." is D. easier to learn. This option correctly uses the comparative form 'easier' to compare tap with 'ballet', the other form of dance mentioned earlier in the sentence. Option B is incorrect because it suggests a comparison with 'any form of dance', which is not what is being discussed in the first part of the sentence. Option C 'easiest to learn', which is a superlative form, is not fitting as the sentence only indicates a comparison between two forms of dance (tap and ballet), not among three or more. Therefore, the comparative 'easier' is the appropriate choice to complete the sentence.