It would be better to use thick viscosity motor oil in

(2) tropical climates (engine heat build-up).

Explanation

While many oil producers make a multiple viscosity motor oil that can be used in both cold and warm climates, you can rule out choice "1" because a higher viscosity or "thick" motor oil tends to become even thicker in cold weather and would make the vehicle even harder to start. Choice "4" is misleading because the motor oil you use would be the same for four or two wheel drive vehicles. Choice "3" is misleading because the Eastern United States has several types of climate.

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