Final answer:
In United States Navy advancement exams, the Navy and Marine Corps Commendation Medal is the medal that provides 3 points towards the exam score for promotion.
Step-by-step explanation:
In the context of advancement exams in the United States Navy, different awards carry varying points towards promotion. For this question, the awards that are worth 3 award points are specifically outlined in the Navy's advancement manual. Among the options provided, the Navy and Marine Corps Commendation Medal is the one that is awarded 3 points towards an individual's examination score for advancement.
The other listed medals, such as the Navy Cross, Navy and Marine Corps Medal, and the Navy and Marine Corps Achievement Medal, carry different point values for advancement purposes, generally with the Navy Cross being among the highest due to its prestige as a valor award.