Given the task definition and input, reply with output. In this task, you need to answer the given multiple-choice question on the physics. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Problem: a circular metal plate of even thickness has 12 holes of radius 1 cm drilled into it . as a result the plate lost 1 / 6 th its original weight . the radius of the circular plate is
Options: ['a ) 16 sqrt 2', 'b ) 8 sqrt 2', 'c ) 32 sqrt 2', 'd ) sqrt 72', 'e ) sqrt 82']
d