It will improve education, make government

It will improve education, make government at all levels more cost-effective and user friendly, reduce health-care costs while improving quality, and give communities new ways to address problems such as crime and pollution.
A. It will improve education, make government at all levels more cost-effective and user friendly, reduce health-care costs while improving quality,
B. It will improve education, make government at all levels more cost-effective and user friendly, health-care costs will be reduced while improving quality,
C. It will improve education, make government at all levels more cost-effective and user friendly, reduce health-care costs while improve quality,
D. It will improve education, make government at all levels more cost-effective and user friendly, reducing health-care costs while improving quality,
E. It will improve education, making government at all levels more cost-effective and user friendly, reducing health-care costs while improving quality

(A) It will do 4 things: improve, make, reduce, and give. Parallel.
(B) Not only is "will be reduced" passive, the verb breaks parallelism. This is a list of 4 active verbs with "it" as the subject. "Will be reduced" makes "health-care costs" the subject of the third action.
(C) "while improve" is incorrect; it should read "while reducing"
(D) "reducing" costs could be OK, if this phrase modifies the previous one; that is, if reduced costs are the result of "more cost-effective and user friendly" government. [BTW, I think rejecting this choice this requires too much outside knowledge for a GMAT question! There really is no grammar flaw in this one, only meaning. That's not particularly GMAT-like.]
(E) "making" and "reducing" could act as adverbial modifiers of the clauses preceding them. Thus, it is bad form to put two in a row: as if there's an adverbial modifier of an adverbial modifer. This would only be grammatically correct with "and" between "making" and "reducing," and even then there would be a question about meaning: Does improving education lead to more cost effective government and reduced health-care costs?

Republicans also benefited from the enthusiastic and well-organized support of conservative Christians concerning about social issues, including abortion.
A. concerning about social issues, including abortion.
B. concerning on social issues, including abortion.
C. concerned about social issues, including abortion
D. concerned on social issues, including abortion
E. concerned social issues, including abortion

(A) "concerning about X" is NOT the correct idiom.
(B) "concerning on X" is NOT the correct idiom.
(C) "concerned about X" is the correct idiom.
(D) "concerned on X" is NOT the correct idiom.
(E) "Y concerned X" is NOT the correct idiom when X is something Y is thinking about.