The correct answers are D, E , and F.
A context clue is a hint given by the author to help readers infer the meaning of a difficult word.
He can do this through Step-by-step explanation, by spelling out the meaning in direcly.
He can resort to personal experience, to call upon background knowledge and help the reader infer the meaning of the unfamiliar word.
Or he help the reader understand the meaning by restating the word with familiar vocabulary.