'Embarrass' means 'to cause to feel self-conscious or ill at ease'. 'Embezzlement' means 'theft or misappropriation of funds placed in one's trust'. 'Ember' means 'a small piece of burning or glowing coal or wood in a subsiding fire'. All these words are spelt correctly. Hence, options A, C and D are not the correct answers.
'Embellishment' means 'a decorative detail or feature added to something to make it more attractive'. It is incorrectly spelt as 'embelishment' in option B. Hence, this is the option with the incorrect spelling.