Which of the Following Is True of Readability Formulas

Which of the following is true of readability formulas?

A) They attempt to measure objectively how easy something is to read.
B) They take many factors into account and are an efficient guide to good style.
C) They avoid depending on analyzing word length and sentence length.
D) They take into account factors that influence the complexity of ideas.
E) They consider the layout and design of a document while analyzing it.