It's a no-brainer
“It’s a no-brainer” is an idiom that we use when something is extremely obvious or easy to understand. It’s like saying that the decision or action is so simple that you don’t even need to think about it. It’s a way of emphasizing that the decision is straightforward and doesn’t require much thought or consideration.
The Idiom “it’s a no-brainer” is often used in everyday conversations to express that something is obvious or simple. It can be used in various contexts, such as deciding between two options, choosing the best course of action, or recognizing an easy solution to a problem. So, when someone says “it’s a no-brainer,” they’re essentially saying that the decision or action is so clear and straightforward that it doesn’t require much thinking or consideration. It’s an informal way of expressing that the choice is obvious and easy to make.