问题详情

According to the passage, a sunscreen can be described as all the following EXCEPT______.
A．it may not carry an expiration date
B．it loses it potency completely in three months
C．its efficacy decreases over time if kept in extreme heat
D．it is a lotion that may protect your skin from ultraviolet radiation请帮忙给出正确答案和分析，谢谢！