Question

earlier in the day, she took a taxi to the airport. knowing that her time was limited.
fragment
sentence
run - on

Explanation:

A sentence fragment is a group of words that does not express a complete thought. In this case, "Knowing that her time was limited" is a dependent clause (it starts with a participle "Knowing" and has a subject "her time" and a verb "was limited" but it cannot stand alone as a complete sentence). It lacks an independent clause to complete the thought. A complete sentence would have an independent clause. A run - on sentence is when two independent clauses are improperly joined. Since this is just a dependent clause, it is a fragment.

Answer:

Fragment