Concept:The error involves the misuse of the idiomatic phrase “a great deal of”.Explanation:The phrase “a great deal of” means a large quantity or amount.It is a fixed idiom; the word “deal” cannot be replaced with “dealing”.In part (b), “great dealing of” is incorrect because it breaks the idiom.Therefore, the correct form is “a great deal of vanity”.The corrected sentence becomes: “Pride brings a great deal of vanity, an egotistic inflation.”Answer:(b)