A.I. Explanation:

Option 1: "Promoting industrial fishing methods"

Explanation: This option is incorrect because the text discusses regulating fishing practices as a means of conservation, not promoting industrial fishing methods. Promoting industrial fishing contradicts the goal of protecting marine life.

Option 2: "Decreasing the number of marine protected areas"

Explanation: This option is incorrect as the text emphasizes the establishment of marine protected areas as a key action for conservation. Decreasing these areas would undermine efforts to protect marine life.

Option 3: "Combating pollution"

Explanation: This option is correct because the text explicitly mentions combating pollution as one of the actions taken to protect marine species and habitats. This aligns with the overall theme of ensuring sustainable ecosystems.

Option 4: "Encouraging the use of plastic in oceans"

Explanation: This option is incorrect because the text does not support the idea of encouraging plastic use in oceans. In fact, combating pollution implies reducing plastic and other harmful substances in marine environments.