Answer:
D) The children were roaming through the field without a care in the world.
B) The tired old dog was searching for water.
Step-by-step explanation:
A present participle is a word that ends with the suffix "-ing" and a verb is usually used to show the action done in a sentence.
Therefore, from the above sentence, the sentence that uses a present participle as part of a verb is option D because the word "roaming" as used in the sentence shows that an action was taking place.