<span>By gradually building up the sea power of the US Navy.</span>
The effects of the Black Death were many and varied. Trade suffered for a time, and wars were temporarily abandoned. Many labourers died, which devastated families through lost means of survival and caused personal suffering; landowners who used labourers as tenant farmers were also affected.
The right choice is B. People voting in secret balloting for the candidates of their choice.
I'm not there studying that unit with you, but the answers are likely Gothic and Romanesque.