Final answer:
The signs of being fatigued can include yawning frequently and drifting out of your lane while driving. Both of these actions are indicators of exhaustion and the need for rest.
Step-by-step explanation:
Being fatigued is more than just feeling tired; it's a state of exhaustion that can affect one's mental and physical capabilities. The signs of fatigue can include:
- Yawning frequently as a response to lack of sleep and as an attempt to increase oxygen intake.
- Experiencing attention lapses and drifting out of your lane while driving, which is a serious indicator of the need to rest.
So, the correct answer, in this case, would be (d. yawning and drifting out of your lane), as both are common signs of being fatigued.