I should have also pointed out option B (CR to SI) is constrained by how many shares can be issued.
GMC can only issue another 330m shares plus 15% of share capital (1.4bn = 210 ) = 540m more shares.
(However, they are able to issue attaching options to reduce the effective price)
Interesting to see how they raise US$10M. As people have pointed out, if they can't raise the full amount then what is the point....