What does the medical acronym b/k mean?

Every person’s body is different, a. but every vehicle’s cabin layout is the same b. and every vehicle’s cabin layout is different c. making some people automatically safe drivers d. making some people better fit to drive a sedan than a coupe

Which are fat-soluble vitamins? a. abcd b. abek c. abdk d. acdk e. adek

Which one is not a part of the base of the cranial cavity? a.scala anterior b.scala media c.scala lateralis d.scala posterior