The correct answer is B.
Hitler's public works programs intended to boost the German aggregate demand through the increase of public spending levels. According to the multiplicative effect of public spending, total demand would experience a larger increase than the initial amount invested.
Moreover, if such public funds are invested on public works, the state is directly creating job positions that would decrease unemployment levels. Newly-incorporated workers will start to earn money and they will be able to buy goods and services themselves, increasing demand levels even further.
