Answer: Option B
Prevents : keep (something) from happening.
Weighs : find out how heavy (someone or something) is, typically using scales.
Gauges : an instrument that measures and gives a visual display of the amount, level, or contents of something.
Calculates : determine (the amount or number of something) mathematically.
Measures : ascertain the size, amount, or degree of (something) by using an instrument or device marked in standard units.
Synonym of Measures is Weighs