English grammar — gerund after the preposition "in addition to": Choose the correction that makes the sentence grammatically sound and stylistically natural. Original sentence: "In addition to enhanced their reputations through strategic use of philanthropy, companies are sponsoring social initiatives to open new markets." Select the best replacement for the highlighted segment.

Given data

• Fixed phrase: "in addition to" requires a noun/gerund, not a past participle.
• Pronoun agreement with "companies".

Concept/Approach
After the preposition "to" (as part of the prepositional phrase "in addition to"), use a gerund (-ing form): "in addition to enhancing...".

Option analysis
A. "of enhancing..." → changes the fixed preposition; ungrammatical in this slot.B. "to having enhance" → mixed forms; should be "having enhanced" if used, but still awkward.C. "to enhancing their reputation" → correct gerund after "in addition to". ✔D. "to have their reputation enhancing" → wrong structure and meaning.E. "No correction required" → original "enhanced" is incorrect after "in addition to".

Corrected sentence
"In addition to enhancing their reputation through the strategic use of philanthropy, companies are sponsoring social initiatives to open new markets."

Common pitfalls
Confusing the prepositional "to" with the infinitive marker.

Final Answer
to enhancing their reputation