301 redirect from OLDEST site to OLD site to a NEW site. Cons, pros, how?

[Ryan_V]

Local business had a site on domain name - (A) for a 5 years. Few years ago they moved to a new domain - (B) and did 301 redirect from A to B. Now they want to move to another domain containing a keyword - (C+kw).com and apply 301

Question:
How to proceed with the redirect for a C+kw not to loose ranking? Which option is better?
1. Redirect from the oldest domain (A) to a newest (C)
A>301>C

2. Redirect from existing domain (B) to a newest (C)
A>301>B
B>301>C

3. Stop existing redirect from A to B, instead do two redirects to a new domain (C)
A stop 301 to B
A>301>C
B>301>C

As far as I know under the same conditions a new domain will rank worse than an aged domain.  On the other part keyword in domain name helps with local SEO. I think that for the long run it's ok to loose some traffic for a few months but have a better chances to rank in future.

What do you think guys?

[Ryan_V]

Thanks.

I checked, A and B both have different direct backlinks profile, so I def want to pass seo juice to new C domain from both of them.

That was the plan to do B>C first, then stop A>B and do A>C. Correct me if I'm wrong I thought I can't keep A>B and A>C at the same time since 301 means permanent move, you can't move to two places at the same time.  So only A>B>C or A>B, B>C.

Which one look less spammy for Google? Does it look spammy at all?