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.

In the last twenty years there has been a lot of progress in this field
In the last twenty years there has been stability in this field
In the last twenty years there have been a number of movements in this field
In the last twenty years there have been many floods in this field

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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.