Explanation:

Only codes 2&3 are correct.

• La Nina is one part of the El Nino Southern Oscillation (ENSO) cycle. In a la Nina event, ocean water from off the coast of South America to the central tropical Pacific cools to below average temperatures.
• This cooling occurs because of stronger than normal easterly trade winds, which churns cooler, deeper sea water up to the ocean’s surface.
• Sea temperatures can warm above average in the far western Pacific when this happens.

Impacts of La Nina

• On Walker Circulation: The unusually cool water in the eastern Pacific influences the Walker Circulation and suppresses cloud, rain, and thunderstorms. This change impacts weather patterns around the world, but in a different way than El Niño does.
• On the Pacific Jet Stream: These cold waters in the Pacific push the jet stream northward. This tends to lead to drought in the southern US and heavy rains and flooding in the Pacific Northwest and Canada. It can also lead to a more severe hurricane season.
• On the Indian Ocean: There are increased temperatures in Western Pacific, Indian Ocean and off the Somalian coast. It also leads to heavy floods in Australia and a comparatively better monsoon rains in India.

Hence option 2nd is correct.