[R] Filtering a dataframe

[Admire Tarisirayi Chirume]

Can someone help on how to filter my data frame below such that it retains
a country if a given id (last column) is satisfied eg filtering a data
frame that has countries with id 1 and 2 only

Country year bank_ratio Reserve_ratio broad_money id
Angola 2006 24 77 163 1
Angola 2007 25 59 188 1
Botswana 2008 38 64 317 2
Botswana 2009 34 65 361 2
Zimbabwe 2010 42 57 150 3
Zimbabwe 2006 49 86 288 3



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