A phrase is commonly defined as a unit or group of words that form part of a clause or a sentence. Unlike clauses, phrases do not contain a subject and verb therefore, they cannot convey a complete thought or idea.
Bearing in mind the stated above, it could be said that in the sentence "<em>Christine blew out the candles on the cake and opened her presents",</em> the phrase is the option a.on the cake since this option not only does not contain a subject and verb but also does not convey a complete thought or idea.
In order to be able to answer this, we'd need to know what book it is you're reading, as well as the answer choices as the question asks "which of the following best" meaning that they want you to choose the best answer from the choices they’re giving you.
