Many people contemplate leasing a car instead of buying one, they are unaware of both the large initial payment that is required and the possibility of another sizeable payment due at the end of the lease.(A) Many people contemplate leasing a car instead of buying one, they are unaware of both the large initial payment that is required and the possibility of another sizeable payment due at the end of the lease.
(B) Many people who contemplate leasing a car instead of buying one are unaware of both the large initial payment that is required and the possibility of another sizeable payment due at the end of the lease.
(C) Many people contemplate leasing a car instead of buying one, and we are unaware of both the large initial payment that is required and the possibility of another sizeable payment due at the end of the lease.
(D) Many people who contemplate leasing a car instead of buying one are unaware of both the large initial payment that are required and the possibility of another sizeable payment due at the end of the lease.
(E) Many people contemplate leasing a car instead of buying one, since they are unaware of either the large initial payment that is required and the possibility of another sizeable payment due at the end of the lease.
Source: GMAT for Dummies