Consider the following sentences with two holes:
Der Titel des ersten Abschnittes dieses Manuskripts ist dem Titel des zweiten Abschnittes viel zu ähnlich. Man sollte ___(A)___ ___(B)___ ändern.
The meaning of the second sentence should be, roughly speaking, "One of these titles should be changed."
Which words would fit at positions (A) and (B)?
For (A):
A1. einen
A2. eins
For (B):
B1. von beiden
B2. von den beiden
B3. davon
B4. der beiden
B5. der Titel
B6. von Titeln
B7. von den Titeln
Please justify your choices. References to established sources are overly welcome.
(Remark: no, it's NOT a homework.)
EDIT: The way it is now (thanks to Björn Friedrich!), I'm wondering whether B1-B4 still make it clear that the titles rather than the sections should be changed.