[Bundle] Some Selections for Admin Only

[Hanmac]

My Problem:
i got a Bundle with an Option, and that Option has some Selections. Let's call them:

• A (5 €)
• B (10 €)
• C (free)

i want Option C "for free" only visible in Admin. (or added via observer)
And the PriceRange should be shown as 5-10€
Right now, the Indexer finds C and makes the PriceRange 0-10€.

Any easy idea on how to exclude C from the visible Eye and the Indexer?