What is a synoptic chart?

a. A chart that maps the path of a storm

c. A chart that maps the path of the jet stream

b. A chart that plots weather for a large region at a given time

d. A chart that summarizes local news stations forecasts

The best answer here is this one:

b. A chart that plots weather for a large region at a given time

A synoptic chart is basically what a weather map (but not on a small scare, rather on a bigger scale) is called by the specialists and scientists!