Sitting up straight and blocking out other distractions in order to focus on the message are examples of which of the following effective listening strategies? being attentive hearing the whole message being prepared listening for details

The answer would be:

Being attentive, hearing the whole message and listening for details.

In my opinion.

Sitting up straight and blocking out other distractions in order to focus on the message are examples of being attentive.

Explanation: In communication, being attentive is a listening skill that allows the person to pay close attention and stay focused. By being attentive, you can pay attenton to detail and have a easier time understanding the message, whereas being distracted and "half-listening" is not as effective.