Final answer:
At sea level, ISA atmospheric pressure is 14.7 PSI. This value is equivalent to 1 atm, which is also the same as 101.325 kPa or 760 mmHg. Therefore, the correct answer is C. 14.7 PSI.
Step-by-step explanation:
The student's question is about the atmospheric pressure at sea level according to the International Standard Atmosphere (ISA). Atmospheric pressure at sea level averages 1.01 × 105 Pa (equivalent to 1 atm), which can be converted into other units of pressure. Using the provided references and conversions, 1 atmosphere (1 atm) is equal to 101.325 kPa, 14.7 psi (pounds per square inch), and 760 mmHg (millimeters of mercury).
Given the options, the correct answer would be C. 14.7 PSI, since this value corresponds with the atmospheric pressure at sea level when expressed in pounds per square inch.