To answer this question, we need to examine each part of the sentence and determine if there are any errors. Let's go through each option:
Option A) a - This option is correct. "The success of a man" is a grammatically correct phrase.
Option B) b - This option is incorrect. The correct phrase should be "The success of a man in business." The preposition "in" is necessary to indicate the field or area in which the man is successful.
Option C) c - This option is correct. "Depends over" is not a correct phrase. The correct phrase should be "depends on."
Option D) d - This option is correct. "His attention to small things" is a grammatically correct phrase.
Option E) e - This option is correct. It states that all parts are correct, but as we have identified an error in option B, this option is incorrect.
Therefore, the correct answer is B. Option B is incorrect because it contains the error in the sentence.