Republicans also benefited from the enthusiastic and well-organized su

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

Concerning about as in A, concerning on as in B, concerned on as in D, concerned
Social issues as in E are all wrong. C is the correct answer

The right answer is option C. The use of concerned about is correct as the right preposition to show the connection between what conservative Christians have concern for, in this case, social issues.

We can eliminate A and B because concerning does not require any preposition in this contest to in order to modify what conservative Christians have concerns for.

We can eliminate D because the use of the preposition on is not appropriate in this context. about is right preposition required here.

E can also be eliminated because it omits a preposition between concerned and social issues. A preposition is required in order to show the connection between the concern that conservative Christians have for social issues.

Concerned about is the correct idiom.

The question beautifully asks the student to difference between verb-ed and verb-ing modifier, and both modify the noun Christians.

Here verbing takes the verb of the sentence and hence, the meaning as such is that Christians were concerning at the very moment republicans benefitted.

Dump A and choose C for this reason.

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Imo C.

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 - Modifier error
B. concerning on social issues, including abortion - seems idiom error (concern on)
C. concerned about social issues, including abortion - seems fine, hold it.
D. concerned on social issues, including abortion - seems idiom error (concern on)
E. concerned social issues, including abortion - Meaning error

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 - WRONG. Verb - ing incorrectly modifies either Christians or previous clause.
B. concerning on social issues, including abortion - WRONG. Verb - ing incorrectly modifies either Christians or previous clause. Addl. problem with usage of 'on'.
C. concerned about social issues, including abortion - CORRECT. Christians is correctly modified by 'concerned about social issues'.
D. concerned on social issues, including abortion - WRONG. Verb - ed correctly modifies Christians but problem with usage of 'on'.
E. concerned social issues, including abortion - WRONG. Not making much sense.

IMO Answer (C).

MEANING: Republicans BENEFITED [past] from the support of Christians CONCERNED [past] about social issues.

IDIOM: concerned about;

Answer (C)

I think that the answer is C.
A) and B) are out. Because ‘concerning’ could be a verb or a preposition here.

In D) and E, ‘concerned’ is a verb. Using the verb there does not make any sense.

In C), ‘concerned’ is an adjective, not a verb or preposition.
‘Concerned about...’ is right one and means that ‘worried’.

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Official Explanation

Correct Answer: C

The word concerned modifies the noun Christians. The preposition that goes with it is about.