is this a pronoun?

[roz.anne]

action B rather than action A

 

[Raymott]

action B rather than action A

No, it's not. Which word are you asking about?

 

[roz.anne]

action B

 

[Raymott]

action B

No, "action B" isn't a pronoun. I note that your native language is English. You could phrase your question better if this hasn't answered it adequately.