The correct answer is option 'B', Hitler Youth.

The Hitler Youth was a Nazi youth organization that existed in Germany from 1922 to 1945. It was established to indoctrinate young boys and girls with Nazi ideology and prepare them for future roles in the Nazi Party and the German military.

Here is a detailed explanation of why the Hitler Youth is the correct answer:

1. Purpose and Formation:
- The Hitler Youth was founded in 1922 as the youth wing of the Nazi Party.
- Its primary goal was to instill loyalty, obedience, and a strong sense of nationalism among German youth.
- The organization aimed to mold young boys and girls into future Nazi leaders and soldiers.

2. Membership:
- The Hitler Youth was open to all German boys aged 14 to 18 years.
- Boys were required to join the Hitler Youth as a mandatory part of their education.
- Girls were also encouraged to join a separate organization called the League of German Girls (Bund Deutscher Mädel), which had similar goals and activities.

3. Activities and Indoctrination:
- The Hitler Youth engaged in various activities, including military training, physical fitness exercises, camping trips, and ideological education.
- Boys were taught skills like map reading, rifle shooting, and basic military tactics.
- The organization promoted Nazi ideals such as anti-Semitism, racial purity, and loyalty to Adolf Hitler.
- Members were encouraged to denounce and report anyone who opposed the Nazi regime, including their own family members.

4. Expansion and Influence:
- By the late 1930s, the Hitler Youth had become the largest youth organization in Germany, with millions of members.
- The organization played a significant role in shaping the minds of young Germans and ensuring their indoctrination into Nazi ideology.
- It aimed to create a generation of obedient followers who would serve as future leaders and soldiers in Hitler's vision of a totalitarian state.

5. Legacy and Disbandment:
- The Hitler Youth ceased to exist after Germany's defeat in World War II in 1945.
- The organization was disbanded, and its activities were condemned as part of the denazification process in post-war Germany.
- Many former members of the Hitler Youth faced consequences for their involvement in Nazi activities during the war.

In conclusion, the Hitler Youth was the Nazi youth organization that consisted of all German boys aged 14 to 18 years. It played a significant role in indoctrinating young Germans with Nazi ideology and preparing them for future roles in the Nazi Party and the German military.