A participial phrase is a phrase that contains a present participle or a word that ends in ing (such as running), or a past participle ending in en (such as proven), as well as modifiers, objects, and compliments. In this example we are looking for a sentence that is properly constructed and is logical in expressing the message of the sentence. Therefore, the best choice is C.) The grocery store clerk placed dented cans on a shelf reserved for items on sale. The other sentences use tenses improperly or construct strange ordering of actions in the sentences.