Question

What did Nazi Germany do to enforce the laws that banned Jews from certain places and jobs?

They posted guards at the home of every Jewish Person so the guards could keep an eye on their activities.
They demanded that all Jewish people move out of German territory.
They forced Jewish people to remain indoors at all times.
They forced Jewish people to wear an armband or badge identifying them as Jewish.

Answer 1

They forced Jewish people to wear an armband or badge identifying them as Jewish.

Explanation: Nazi authorities required Jews to be visibly marked (most famously the yellow Star of David with "Jude") so they could be excluded from public life and more easily identified for arrest, fines, and later deportation. Enforcement was carried out by police, local officials, the SS, and racist regulations (signs, identity papers, curfews, bans from businesses and professions). The other choices are inaccurate as stated: they did not post guards at every Jewish home, they did not issue a single order for all Jews to leave Germany at once (though emigration was encouraged and later mass deportations happened), and they did not make Jews stay indoors at all times (there were curfews and many restrictions, but not a universal rule of remaining inside).