Convert the sentence provided below from its passive voice structure to an active voice structure:
The parcel is delivered to the reception desk every evening.

The correct option is "Someone delivers the parcel to the reception desk every evening."

Step-by-Step Explanation:

1. Identify the Tense and Voice of the Original Sentence:
The given sentence is: "The parcel is delivered to the reception desk every evening."
This sentence is in the Passive Voice using the Simple Present Tense (formed with is + past participle "delivered").

2. Identify the Subject and Agent:
In the passive sentence, "The parcel" is the receiver of the action (the passive subject). The performer of the action (the agent) is unstated (an unspecified person). When converting an unstated agent to active voice, an indefinite pronoun such as "Someone" is introduced as the active subject.

3. Convert to Active Voice Structure:
The standard active voice structure for Simple Present Tense is:
[Subject] + [Verb (base form / -s / -es)] + [Object] + [Remaining Information]

Applying this structure:
- Subject: Someone
- Verb: delivers (Simple Present tense corresponding to third-person singular "Someone")
- Object: the parcel
- Remaining Info: to the reception desk every evening

Combining these elements gives the active voice sentence:
"Someone delivers the parcel to the reception desk every evening."