Which of the Following Is True for Writing Concise Sentences

Which of the following is true for writing concise sentences?

A) All relative pronouns should be eliminated from sentences to minimize confusion.
B) Using infinitives to replace phrases is grammatically incorrect.
C) Longer words usually make a sentence easier to read and understand.
D) Double modifiers are easy to understand and make a sentence more concise.
E) The subject and predicate of a sentence should be placed as close together as possible.