The correct option is E many people are turning to stock brokers for help in buying stocks that could easily be
Interestingly, the sentence has no grammatical errors but a meaning error. The given sentence is illogical in the sense that it means that the stock brokers don't trust themselves to choose wisely among the investment opportunities in the market and that they are helping many people who come to them to invest. Here, the initial verb-ing modifier needs to modify 'people', who don't trust themselves to choose wisely and thus turn to stockbrokers for help. Options A and B are incorrect for this meaning error. Additionally, '...that they could easily have bought' in option B is incorrect given the use of the present tense 'are helping' of the main clause. "Could have bought" refers to a condition that has already happened. Since the sentence is not talking about a past event that did not happen, it is incorrect. The use of 'help... to + verb' in option C is incorrect because when 'help' is used as a noun (as in the sentence) the correct form is 'help...in + verb-ing'. Also, option C becomes too wordy with the use of 'from them' - there is no need for them in the sentence. Option D repeats the errors of both option B as well as C. Option E best befits the context because it not only clears the error in the original sentence but also specifies 'help in what'