At about 8 months, children become increasingly likely to react to newcomers with tears and distress. this best illustrates

This best illustrates Stranger anxiety 
Stranger anxiety refers to psychological distress that children experience if they're being near someone that they're not used to/acknowledge.
Symtoms that exist within stranger anxiety includes crying really loudly while making a movement to stay away from the stranger, or become extremely quiet without making a movement at the present of the stranger.

The correct answer is "the protesters were attacked by chinese troops and many were killed or arrested."