Among lower- paid workers, union members are less likely

Among 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
b). imposing stricter limits on medical services , requiring doctors to see more patients, and spending
c). that impose stricter limits on medical services, require doctors to see more patients, and spend
d). that impose stricter limits on medical services and require doctors to see more patients, and spending
e). that impose stricter limits on medical services, requiring doctors to see more patients and spending

OA below -
















OA is D. I dont quite understand how D maintains parallelism. C sounds better to me.