The three angles of a triangle are in the ratio 1:2:1. Find all the angles of the triangle.

Question

( A ) 45^{\circ},90^{\circ},45^{\circ}
( B ) 45^{\circ},100^{\circ},45^{\circ}
( C ) 40^{\circ},100^{\circ},40^{\circ}
( D ) 50^{\circ},80^{\circ},50^{\circ}