The correct answer is A. Somnolog
Many patients with ADHD are constitutional short sleepers who do not complain of fatigue or excessive daytime sleepiness even though sleep duration is shorter than optimal or even average.
The simplest and most informative tool to assess multiple parameters of sleep is a somnolog: a visual representation of sleep. A somnolog provides an immediate visual representation of night to night variability, sleep onset latency, sleep duration, and an excellent map with which to measure response to sleep hygiene.
For more on this topic, see ADHD: A 24-Hour Disorder, on which this discussion is based.