Each sentence below has two blanks, each blank indicating that something has been omitted. Choose the set of words for each blank which best fits the meaning of the sentence as a whole.

The teacher _________ the concept by _________ practical examples.

A. showed, telling

B. gave, speaking

C. liked, citing

D. explained - quoting

Please do not use chat terms. Example: avoid using "grt" instead of "great".