In which of the following sentences does the use of prepositional phrases make it harder for readers to find the main point of the sentence?
a. in what way is a political group considered grassroots when it overseen by a pair of wealthy businessmen?
b. the committee voted on several of the issues under consideration.
c. under the circumstances in which the staff found themselves, they decided, in anticipation of layoffs, to go on strike.
d. the senator chose to run on a platform that cut taxes for the wealthy.