Most technicians start as an technician before acquiring the skills necessary to become a line technician.

Explanation:

Most technicians start as an  automotive  technician before acquiring the skills necessary to become a line technician.

B. to promote happiness and peace during the Christmas season

Explanation:

After the Japanese attack on Pearl Harbor, the British Prime Minister Winston Churchill flew to Washington, D.C. in order to meet President Franklin Roosevelt and discuss how the two countries (Britain and the United States) could coordinate strategy in the wake of Japan’s attack on Pearl Harbor. Since he was away from Britain, Churchill broadcast to the world from the White House and the purpose of his speech was to dedicate the night and holiday to children. Churchill wanted the people to celebrate the night without the cares of war, especially the children (“Let the children have their night of fun and laughter”). The rest of the options are incorrect because they are a misunderstanding of the text (A, C), or an action that has already happened, that is, the union of Britain and the United States (D).