The Works Progress Administration (WPA) was responsible for

The Works Progress Administration employed millions of job seekers(mostly consisting of unskilled men). These people, now employed, carry out work projects such as the construction of buildings and roads.  

Explanation:

This administration was the most ambitious American New Deal agency.

The Works Progress Administration (WPA; renamed in 1939 as the Work Projects Administration) was an American New Deal agency, employing millions of job-seekers (mostly unskilled men) to carry out public works projects, including the construction of public buildings and roads

a. the astrolabe could determine the correct latitudinal location of the ship

c) troops march forward in close formation against newer, more accurate weapons