What is the selling condition in the 10-Day Moving Average Rule?

In the context of the 10-Day Moving Average Rule, the correct selling condition is based on the idea that a security's price action relative to its moving average provides insight into its trend. Specifically, the rule indicates that when the price penetrates the lower band, it suggests a weakening trend or a potential downtrend, which may indicate that it is time to sell or exit a position.

The 10-Day Moving Average serves as a trend-following indicator; thus, when prices move below this average or penetrate lower bands of volatility (if using a band-based method), it signals that the price action is becoming bearish. This technical signal is a cue for traders that the momentum is shifting downward, prompting a reconsideration of long positions.

The other options relate to different price movements or structures but do not align with the specific rule regarding the 10-day moving average in this context. Understanding how moving averages work as support and resistance levels helps clarify why recognizing a breach of lower bands can lead to a selling decision.