IMO
AAmong lower- paid workers, union members are less likely than non union members to be enrolled in lower- end insurance plans
imposing stricter limits on medical services and requiring doctors to see more patients, and spend less time with each.
a). imposing stricter limits on medical services and requiring doctors to see more patients, and spend -->
imposing ... and requiring ... are the two parallel participle phrases correctly modifying for plans. And one more correct parallel structure: require doctor to see ... and spend...--> the bestb). imposing stricter limits on medical services , requiring doctors to see more patients, and spending --> 2 paralleled participle phrases:
imposing ..., requiring ... are correct because they appropriately modify for
plans. However, the last paralleled complement
spending ... will wrongly modify for
plans.
Plans can't spend, just
doctors spend less time for each of their patients
c). that impose stricter limits on medical services, require doctors to see more patients, and spend -->
require and
spend here in this structure are both verbs for
union members, wrongly distorting the original meaning
d). that impose stricter limits on medical services and require doctors to see more patients, and spending -->this structure can be summarized as:
union members are less likely ... and spending ... -->
spending placed here will distort the original meaning
e). that impose stricter limits on medical services, requiring doctors to see more patients and spending -->
that impose ... services correctly modifies for
plans,
requiring doctors ... more patients is also correctly placed to modify for
plans. However, the 2nd participle phrase
spending ... with each is not correctly placed here (mentioned error in B)