at least 5% ，这个哪里有规定吗？

问题如下：

When a security that was in an upward trend falls 1% below its trendline, a technical analyst will most likely determine that:

选项：

A.a downward trend is beginning. B.the upward trend is ending. C.the trendline needs an adjustment.

解释：

When a security’s price drops through the trendline by a significant amount (at least 5% to 10%), this decline signals that the uptrend has ended and further decline may follow. Minor breakthroughs simply call for the trendline to be moderately adjusted over time. A security falling 1% below its trendline is considered a minor breakthrough.A is incorrect. The amount the price falls below the trendline would need to be at least 5% before it would be considered a signal that the uptrend is ending and may signal a further decline in price.B is incorrect. The amount the price falls below the trendline would need to be at least 5% before it would be considered a signal that the uptrend is ending.