In these difficult economic times, those who have public pen

In these difficult economic times, those who have public pensions veterans, mail workers, firemen, and others are being pursued strongly by pension advance companies that operate without much oversight from banking regulators, but they are now drawing scrutiny from several other government organizations.

a. are being pursued strongly by pension advance companies that operate without much oversight from banking regulators, but they are now drawing scrutiny from several other government organizations.

b.are being pursued strongly by pension advance companies, which operate without much oversight from banking regulators but are now drawing scrutiny from several other government organizations.

c.are pursued strongly by pension advance companies and operate without much oversight from banking regulators but are now drawing scrutiny from several other government organizations.

d.are pursued strongly by pension advance companies, operating without much oversight from banking regulators but now drawing scrutiny from several other government organizations.

e. are pursued strongly by pension advance companies who operate without much oversight from banking regulators; however, they are now drawing scrutiny from several other government organizations.


E-gmat could this example be a good choice to understand the verb-ing modifier concept?