A recommended way to intervene when someone has had too much to drink is to:

Answer: B — Get help from others

When someone has had too much to drink, it's important to intervene in a way that prioritizes their safety. Letting them drive themselves home (A) is never recommended, as it puts both the individual and others on the road at risk. Encouraging them to drink more water (C) may help with hydration, but it does not address the larger issue of their intoxication. Leaving them alone (D) also puts an individual at risk, as they may harm themselves or others while under the influence. Getting help from others (B) is the best option because it allows for someone else to step in and ensure the safety of the intoxicated individual, while also potentially preventing them from making dangerous decisions.