Tire with adequate tread primarily reduces the risk of what?

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Adequate tire tread depth helps water escape from under the tire as it rolls, keeping the tire in contact with the road and preserving grip on wet surfaces. That maintained traction reduces the chance of hydroplaning, where a slick layer of water lifts the tire from the road and you lose steering and braking control. The other options aren’t about tire grip in wet conditions: engine overheating relates to the cooling system, a tire blowout comes from structural failure or underinflation, and water splashing on the windshield is more about spray than the tire’s ability to channel water. So the primary safety benefit of enough tread on wet roads is preventing hydroplaning.