The correct term to fill in the gap is that, "...the proposed color scheme is not attractive the interior designer..."
The best term to include in the sentence above would be an adjective as the term needed is one that would describe the color scheme.
The best adjective would be one that has the suffix -ive and out of the options, the best one was the word, "attractive" as this describes the color scheme adequately.
In conclusion, the best answer is attractive.
Find out more on adjectives at https://brainly.com/question/550822.
