Identify the sentence that correctly employs an infinitive phrase as a post-modifier.

• ক To seal the cracked pipe, the engineer used a special sealant.
• খ The sealed pipe prevented any further leakage of toxic gas.
• গ The engineer worked efficiently to finish the pipeline maintenance.
• ঘ The engineer made a calculated decision to seal the cracked pipe. ✅ সঠিক উত্তর