Answer: active
Step-by-step explanation:
There are two types of "voices": active and passive. When the subject is *acting*, it's active voice. When the subject is being acted upon, it's passive voice.
Examples:
Active: The science class viewed the comet.
The science class is acting. They are viewing.
Passive: The comet was viewed by the science class.
The comet is being acted upon. It is being viewed by something. It isn't doing anything.