【单选题】
You are developing an application to perform mathematical calculations. You develop a class named <br /> CalculationValues.You write a procedure named PerformCalculation that operates on an instance of the class.You need to ensure that the user interface of the application continues to respond while calculations are being performed.You need to write a code segment that calls the PerformCalculation procedure to achieve this goal.Which code segment should you use？（）<br /> <img src="https://nimg.ppkao.com/2018-07/zhoulian/2018072708392437862.jpg?sign=76d867e60928bed1fee4fd76253909f0&t=62d185bd" />
A、A
B、B
C、C
D、D
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