Which of the Following Is Not a Part of the External

Which of the following is not a part of the external history of the English language?

A) The development of Old English from a combination of the linguistic systems of the Angles, Saxons, and Jutes.
B) The raising of the majority of the vowels in English through the Great Vowel Shift.
C) Borrowing words such as chalice and hymn due to the Christianization of England.
D) The incorporation of new linguistic forms, such as the pronouns they, they, their and the phonological pattern