The Treaty of Open Skies has ________ many signatories ?

a) 40
b) 50
c) 35
d) 30

The Treaty of Open Skies was signed on January 1, 2002. The treaty has 35 signatories including Russia, the US, the UK, Germany, France, Canada, Spain, Portugal, Italy and Greece. The treaty allows unarmed aerial surveillance flights over the entire territory of the participating countries.