If sometimes you are not sure, about the 1st part of the sentence
Look at the end
to implement
than in 1973 , than what in 1973 ? , there is a missing reference - A ruled out.
to implement
as in 1973 , as in What in 1973 ? , there is a missing reference
to implement than
it did in 1973 ,
to implement than
it did in 1973 ,
to implement
than in 1973 , than what in 1973 ? , there is a missing reference - E ruled out.
The references whether verbal, or noun has to be linguistically equal - APPLE for APPLE , and ORANGE for ORANGE.
it did is correct - we can narrow down to C and D
antecedent of
it is the welfare program
the welfare program now costs about 3 billion real dollars less than it did or
than the welfare program costed in 1973
Refer :
https://www.thefreedictionary.com/costed
Frequently, we never use the term - Costing.....refer to the technical tip shared by Jen.
Hence, D is the correct answer.
Hope this helps.....
