[QA] Televised lessons prove very useful in assisting students to revise what they have learnt in class

Mark the letter A, B, C, or D on your answer sheet to Indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions.

Question:

Televised lessons prove very useful in assisting students to revise what they have learnt in class

• A.
  preventing
• B.
  defending
• C.
  helping
• D.
  saving