Noun:
транспорт, транзит, проводимост, електропроводимост.
Verb:
транспорт, слагам, транзит, поведение, ръководене, депортирам, изгнание.
...the TRANSPORT of electrons through the nano-fabricated rings...
Let's see. Bradley tank. TRANSPORT truck. Batmobile.
electron TRANSPORT in graphene.
There are a number of acceptable answers. For example, C, near-Earth TRANSPORT.