An instrument with air as fluid was involved in some experiment( specific volume was the characteristic property utilized) which was conducted during day in desert. Due to some reason experiment couldn’t be conducted during day and had to be conducted during night. However there were considerable errors in obtained values. What might be the reason of these errors?

• A. It was human error
• B. It was instrumental error
• C. Error was due to the fact that experiment was conducted at night
• D. None of the mentioned