Read the sentence, then choose the sentence which is closest in meaning to the original sentence.

In the last twenty years there have been a number of positive developments in this field.

Выберитеодинответ:

a. In the last twenty years there has been stability in this field

b. In the last twenty years there has been a lot of progress in this field

c. In the last twenty years there have been many floods in this field

d. In the last twenty years there have been a number of movements in this field