In the given question, a sentence is given with a part of it missing and represented by a blank. Choose the phrase that can be placed in the given blank to make a meaningful and grammatically correct sentence.
For more than two years the World Bank and the International Monetary Fund _________sub-Saharan Africa stands on the verge of a debt crisis.
1
have warned that
2
have suggested that
3
have criticized that
4
have exercised that
5
None of these