b. Always ask yourself this question: “ Am I pleased with the results?”
A colon should be used when there is a complete sentence before it. In option B, "Always ask yourself this question" is a complete sentence.
Option A is incorrect because after "yourself" your brain automatically wants to say "is ...". Option B is incorrect because the quotation is embedded within the sentence so there should not be any punctuation after "is". Option D is also incorrect. There should not be any punctuation after the word "like" either.
