Final answer:
A single engine aircraft may be used by an air taxi operator in night VFR conditions with passengers on board to provide a commercial air service provided it is authorized to do so in its AOC and the operator complies with the commercial air service standards.
Step-by-step explanation:
The correct answer is b) may be used by an air taxi operator in night VFR conditions with passengers on board to provide a commercial air service provided it is authorized to do so in its AOC and the operator complies with the commercial air service standards.
According to the given options, a single engine aircraft may be used by an air taxi operator in night VFR (Visual Flight Rules) conditions with passengers on board to provide a commercial air service, but certain conditions need to be met. The operator must be authorized to do so in its Air Operator Certificate (AOC), and the operator must comply with the commercial air service standards.
For a single-engine aircraft to provide a commercial air service at night, it must be authorized and meet the necessary safety and operational standards set by the aviation regulatory authority.