Final answer:
The sentence written in the active voice is the first one: "We ended our trip early due to bad weather." The subject "We" is actively performing the action of ending the trip, which signifies active voice.
Step-by-step explanation:
To identify the sentence written in active voice, we need to determine which sentence has the subject performing the action. In active voice, the subject of the sentence acts—the subject performs the action of the verb. Let's examine each sentence provided:
- We ended our trip early due to bad weather.
- The computers were protected by anti-virus software.
- Three kinds of cheesecake were brought by Shauna.
- The tire was punctured by a nail in the driveway.
The sentence written in the active voice is: "We ended our trip early due to bad weather." Here, "We" is the subject, and "ended" is the verb. The subject is directly performing the action of ending the trip, which indicates it's in the active voice. The other sentences are in passive voice because the subjects are receiving the action, rather than performing it.