Benzodiaepines Are Common Anti-Anxiety Drugs That Are Administered to Patients

Benzodiaepines are common anti-anxiety drugs that are administered to patients because they affect the release of neurotransmitters in the brain. Taken in pill form, they are often fast acting and readily diffuse into the brain tissues. What conclusion can be made about benzodiazepines in the BBB?

A) they are small enough to quickly pass through
B) they are not water soluble
C) they carry no net charge, but have polar regions
D) they readily bind with carrier proteins to get through