Interesting Syntax!

I am reading a Radford, who is a prof. at Cambridge Univ. Look at the sentences below.
A. A venue is decided right on.
B. A label is torn right off.
C. A problem is brought right up.

A is Ungrammatical while B is grammatical. Then what about C?
How can we explain this distribution of the Specifier 'right' with the phrasal and prepositional verbs and their passivization?