None of the options is correct.
INTERMITTENT ACTIVITY means that you perform said activity at irregular intervals, in a sporadic way. On the contrary, the options mentioned require the subject to participate actively. For example, in order to develop a skill it is important to practice a lot. In the same way, if you focus on what you are hearing, you are paying attention which is the opposite to what an intermittent activity is.
The migration in the 1980's changed by how it increased so dramatically.
due to the lack of info I'm gonna include that it is A) valued
Legalism influenced the Chinese society during its dynastic era because it prescribed harsh penalties for any minor crime. Legalism was a belief the ancient China people had that humans were able to do more wrong than right. Because they were only motivated by things that for were for self gain.