Sentence Correction

Dear instructors,

I can under the correct answer, but I am not clear about adverb issue , please help to clarify.

Not trusting themselves to choose wisely among the wide array of investment opportunities on the market, stockbrokers are helping many people who turn to them to buy stocks that could be easily bought directly.
(A) stockbrokers are helping many people who turn to them to buy stocks that could be easily
(B) stockbrokers are helping many people who are turning to them for help in buying stocks that they could easily have
(C) many people are turning to stockbrokers for help from them to buy stocks that could be easily
(D) many people are turning to stockbrokers for help to buy stocks that easily could have been
(E) many people are turning to stockbrokers for help in buying stocks that could easily be

what the difference between "could be easily brought" and "could easily be brought"

thanks in advance
have a nice day
>_~