HBP: Another notable discrepancy

[pippin_999]

It's
Too
Early
To
Think
Up
Anything
Clever
To
Put Here

Snape tells Bella and Narcissa that he's the one who gave Voldemort
the information which led to the death of Sirius. At first glance that
ties in with Harry blaming Snape for Sirius's death. But Snape doesn't
say he goaded Sirius into going to the MoM. He specifically mentions 
information. But the information we know about was Kreacher's and
he supposedly gave it to Narcissa! But she doesn't call Snape on this.

Some possibilities:

A) It's a Flint. Jo forgot that Narcissa would know who gave Voldie
the info.

B) It's a test. Snape wants to find out whether Narcissa will cover
for him.

C) Kreacher was lying -- it  *was* Snape who told
Voldie about the closeness between Sirius and Harry, and Narcissa
has no idea that she was supposed to be the conduit

D) Kreacher was lying, Narcissa didn't know anything,   -- and Snape 
reported this to Dumbledore, who then became quite anxious to secure 
Kreacher at Hogwarts. It remains for Harry to discover who Kreacher
was trying to protect.

Thoughts?

Pippin
remembering that the sixth obstacle was a *logic* puzzle