The answer would be D. People in Northern and Western Europe started planting and eating potatoes as an important source of nutrition.
Qualitative data is more about the quality of the data you're collecting. Quantitative data is how much(numbers) is in the data set.
B.
For those that could not write (So most), they carried a seal around either on a necklace or otherwise that they could use to stamp with ink to signify 'signing' something.
"<span>A.
countries shown in dark blue" given the key these areas have a higher population making them more developed</span>
