Academic Writing Directions: Use Your Knowledge of Writing, Editing, and the Conventions of the Conventions

Academic Writing Directions:
Use your knowledge of writing, editing, and the conventions of grammar to answer the following questions.
Which of the following indicates the proper way to fix a sentence fragment?​

A) ​Add a missing subject.
B) ​Add a missing predicate or a helping verb.
C) ​Provide words that complete the thought of the sentence.
D) ​all of the above