All four words start with "c-o-l" so we have to compare the fourth letter in each word to see which one would come first in the dictionary. Colorful has an "o", collegiate has an "l", colonel has an "o", and colonial has an "o". "L" comes before "o" in the alphabet. so the word collegiate will come first in the dictionary out of all the other words.
The only answer option with collegiate (or b) first is "b, c, d, a", so that is your answer. I hope this was helpful! Have a lovely day!! :)
