Which of the following country has been not invited by Russia in Troika Plus Meeting?

Which of the following country has been not invited by Russia in Troika Plus Meeting?
A. US
B. India
C. China
D. Pakistan
Explanation:
India has not been invited to a key meeting convened by Russia on the fast-evolving situation in Afghanistan that is expected to be attended by Pakistan, China and the US. A troika is a traditional Russian harness driving combination, using three horses abreast, usually pulling a sleigh. It differs from most other three-horse combinations in that the horses are harnessed abreast.