Which of the Following Is True of a Language Group

Which of the following is true of a language group?

A) It is a collection of languages within a family related through a common ancestral language that existed several thousand years ago
B) It is a collection of languages related through a common ancestral language that existed long before recorded history
C) It is a group of people for whom the language is their first language.
D) It is a collection of languages within a branch that share a common origin in the relatively recent past and display relatively few differences in grammar and vocabulary
E) No language group has fewer than 4 billion speakers