What is a sacrifice?

A sacrifice typically involves giving up something of value (time, resources, comfort, desires) for the sake of something or someone else, often for a greater good or a cause.

• A) It is a time when someone is without much money. While a sacrifice might result in someone having less money, being without money is not the definition of the act of sacrificing itself.
• B) It is when someone gives to, or helps, a person or a cause. This definition aligns well with the concept of sacrifice, as it involves giving something up or exerting effort for the benefit of others or a principle. For example, sacrificing time to help a friend, or sacrificing personal comfort for a cause.
• C) It is an action that leads to someone's feelings being hurt. While some sacrifices can be emotionally difficult, hurting feelings is not the primary definition or purpose of a sacrifice.
• D) It is when someone is talking about and planning an event. This describes communication and organization, which is unrelated to the concept of sacrifice.

Option B most accurately captures the essence of sacrifice, which is an act of giving or helping, often at a personal cost.

The final answer is $\boxed{\text{B}}$