Question

Which European countries had influence over Iran during the 20th century?

Answer 1

Your Answer would be Britain and Russia. Simply because the other options are not euro countries(save Germany). Yet also Britain and Russia really did have control as well. 

Answer 2

Britain and Russia had influence over Iran during the 20th century. Option A is correct.

The great peaceful Constitutional Revolution of 1906 forced the Iranian shah at that time to declare Iran a constitutional monarchy with legislative powers vested in a majles, or parliament. The shahs did not fulfill their constitutional promised, therefore, the Russian and British encroachment was even increasingly perilous.