English idiom — "make both ends meet": Replace the incorrect infinitival structure to fix the sentence. Original sentence: "Their earnings are such that they find it difficult to make both ends to meet." Choose the best improvement for the underlined segment.

Given data

• Standard idiom: make both ends meet (= manage with available income).
• Construction: "find it difficult + to + bare infinitive".

Concept/Approach
Keep the idiom intact and use a simple infinitive after "to": "to make both ends meet". Any added "to" before "meet" is ungrammatical.

Option analysis
C. "to make both ends meet" → correct idiom and structure. ✔A/B/D → malformed or wordy; wrong prepositions or gerunds.E → original duplicates "to".

Corrected sentence
"… they find it difficult to make both ends meet."

Final Answer
to make both ends meet