Secondary analysis a) the relationship between two variables that can be observed and measured b) measures the opinions and attitudes of individuals in a society c) data that has already been gathered from a legendary population d) an equal chance of being selected for each person

b

explanation:

united states reinforcements contributed greatly to three allied victories in france at: cantigny (first major american battle), argonne (the largest in the united states military history, involving 1.2 million american soldiers), and château-thierry (one of the first actions under general pershing).