Select the option that expresses the given sentence in passive voice.

They catch whale sharks commercially in some places around the world.

Whale sharks are caught commercially in some places around the world.

The correct passive voice form of the sentence "They catch whale sharks commercially in some places around the world" is Whale sharks are caught commercially in some places around the world.

The active voice of the sentence is "They catch whale sharks commercially in some places around the world." This sentence is in the present tense, which is used to describe an action that happens regularly or habitually. The passive voice of the sentence is formed by putting the subject of the active sentence after the verb "to be" and the past participle of the main verb. In this case, the subject of the active sentence is "they" and the main verb is "catch." The past participle of "catch" is "caught." So, the passive form of the sentence is "Whale sharks are caught commercially in some places around the world."

The other options are incorrect because:

• Whale sharks were caught commercially in some places around the world." This sentence is in the past tense, but the action of catching whale sharks is still happening in some places.
• Whale sharks are being caught commercially in some places around the world." This sentence is in the present progressive tense, which is used to describe an action that is happening now but is not finished. However, the action of catching whale sharks is not happening now in all places around the world.
• Whale sharks have been caught commercially in some places around the world." This sentence is in the present perfect tense, which is used to describe an action that has happened in the past and is still relevant to the present. However, the action of catching whale sharks is not happening now in all places around the world.