We wont be good enough for div C and thats agreeable, but we will be promoted to div C if we participate, as we would come in top 2 of Div D (also note that most players of VG and Vikingers have retired)
You keep forgetting that you'll be facing two clans that relegated from C, which currently are BIA and PE.
You're not beating them, which means you're not promoting.
Not to even mention THD, or any other clan joining CL.
How hard is it to comprehend?