Final answer:
The most relevant objective for a project aimed at reducing colon cancer is to decrease the intake of alcoholic beverages by 10% among individuals ages 21-55, directly targeting a known risk factor.
Step-by-step explanation:
The most relevant objective for a multiyear project directed at the reduction of the incidence of colon cancer in a community is to decrease by 10% during the next year the intake of alcoholic beverages among individuals ages 21-55. This directly addresses one of the risk factors for colorectal cancer, which is excessive alcohol consumption. Adjusting lifestyle choices such as reducing alcohol intake can have a significant impact on decreasing the risk of developing colon cancer. Providing knowledge or training regarding diet, while important, is less directly quantifiable in the short term compared to the direct measurement of reduced alcohol consumption.