There are four communication skills that have proven to be very effective when sharing information. The four skills are Using I messages active listening assertiveness and what

A. Aggressiveness
B. Body language
C. Cooperation
D. Compromise

C. Cooperation

The correct answer is C. Cooperation.

To arrive at this answer, we need to understand the question and the options provided. The question asks for the fourth communication skill that is effective when sharing information. The question also mentions three other skills - Using "I" messages, active listening, and assertiveness.

Let's go through the options provided:

A. Aggressiveness: Aggressiveness is not an effective communication skill when sharing information. It involves being forceful, confrontational, and intimidating, rather than creating an open and positive environment for sharing information.

B. Body language: Body language is important in communication, as it can convey messages without using words. However, it is not specifically mentioned in the question and is not one of the four skills mentioned.

C. Cooperation: Cooperation is the willingness to work together and collaborate. In the context of sharing information, cooperation implies being open to different perspectives, actively engaging in discussions, and finding common ground. This aligns with effective communication and problem-solving.

D. Compromise: Compromise refers to reaching an agreement by giving up something to meet halfway. While compromise can be a useful skill in certain situations, it is not specifically mentioned in the question and does not relate directly to sharing information.

Based on the analysis, the correct answer is C. Cooperation.

C. Cooperation