The answer is C. Subtropical winter rain
Subtropical is a zone characterized by two seasons only; summer and winter. It is known for hot and humid summers, and mild to chilly winters. The winter season is not a cold winter. They generally between latitudes 25° and 35° on the southeast side of all continents.
As compared to the subtropical climate type, the continental temperate contains warm and humid summers and cold and harsh winter.
On the medieval world-maps it was represented only the part of the world known as the 'old world', which is consisted of Europe, Asia and Africa. Before the big discoveries, people living in this continents had knowledge only of this part of the world, while South and North America, Australia and Antarctica where still unknown to them, thus they are missing in the world-maps of this period.
A the southwest isnt an area that is fully populated yet due to the land layout and the weather and lack of jobs
The density of an object or quantity of matter is its mass divided by its volume. ... Non-standard conditions can result in a change of volume, affecting the density of the materials. Also, certain temperatures and pressures can result in a change the state of the matter, which also affects the density.
Because it was a very unexpected event and they didnt have the tech to forecast it