Answer and explanation

Correct answer: C. Sensors were installed in order to monitor pipe pressure continuously

  1. Step 1: 'In order to + base verb' expresses purpose or objective in technical writing. Answer: Sensors were installed in order to monitor pipe pressure continuously. Why not the others: 'because' must be followed by a clause with a conjugated verb, 'so' requires 'that' or a complete clause, and 'although' expresses concession rather than purpose.

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