单选题：上证综合指数的计算公式是（）
A、img src="https://www.ywz1.com/upload3/ba5/6cdf34bbdd009ba645530ef2180a9.jpg" width="278" height="41" />
B、img src="https://www.ywz1.com/upload3/88d/98ece22f05b5f75e9b34eb11fee7d.jpg" width="290" height="40" />
C、img src="https://www.ywz1.com/upload3/893/7db43916af22a4bafed07da0a7fa3.jpg" width="230" height="39" />
D、img src="https://www.ywz1.com/upload3/d13/e22c2a3a4c54337d306ea9f005c4d.jpg" width="140" height="44" />

答案：A

解析：上证综合指数的计算公式为: