<prompt> Bainisha fxfrac1x1-x na gxfrac-2x1. Tafuta thamani ya gfgfdotsb gf12 dotsb ambapo namba tegemezi f imetumika mara 8, na namba tegemezi g imetumika mara 8, ikibadilishana kati ya hizo mbili.A. 12 B. 8 C. 4 D. 0  <response>: <reason> C 