某商场某种商品价格第一季度是连续上升的。1月份单价20元,销售额12万元;2月份单价25元,销售额10万元;3月份单价30元,销售额13万元。则第一季度的平均单位商品价格为( )。
A、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1551504237005c55e945170224db1b2cd4706c03c55f5image1.png" style="width:72px;height:36px;">
B、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1551504237071c3d46cf9681640a4933f304a4922305cimage2.png" style="width:141px;height:36px;">
C、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/155150423711673d8785b388e4ca0bb37b274a953f99fimage3.png" style="width:77px;height:20px;">
D、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/155150423716257f797e88fc046a1b9efc23db63a0aa1image4.png" style="width:75px;height:51px;">
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