Bianca Andreescu has become the first teenager to reach US Open semi-finals in a decade. Andreescu belongs to _____ nation ?

a) US
b) Switzerland
c) Canada 
d) Germany

Canada’s Bianca Andreescu has become the first teenager to qualify for the US Open semi-finals in a decade. Andreescu defeated Belgium’s Elise Mertens to qualify for the semi-finals. She will be fighting for the finals spot against twelfth seed Belinda Bencic.