Answer:
D. The top of the building was higher than I expected.
Step-by-step explanation:
Modifiers are those words or groups of words that are added in a sentence/ to a noun to further provide more description to them. Among the four options provided in the question, Option D has the correct application of the modifier 'high' in its sentence construction. For the use of the comparative or superlative degree of 'high' depends on the form of the verb used in the sentence. Thus,
A. The top of the building was more high than I expected. (Wrong in its use of the verb- adverb agreement)
B. The top of the building was highest than I expected. (as there are no direct comparison numbers, highest cannot be used)
C. The top of the building was more higher than I expected. (used only when comparing two options)
D. The top of the building was higher than I expected. (correct)