It can be inferred from the chart shown that
a. german immigration rates are twice that if italians.
b. chinese is decreasingly popular in the united states.
c. immigration in the united states has slowed significantly.
d. there is significant diversity in language usage in the united states.
It would be much better if you attached the chart to find right answer. I suggest you to search the chart and compare all definitons. Then you can consolidate some to get the answer.