When creating a new escalation, what is the most likely reason that the conditional SQL Expression B

When creating a new escalation, what is the most likely reason that the conditional SQL Expression Builder does not list attributes to use?

A.
An object has not been linked in the Applies To field.

B.
The escalation has not been linked to an existing attribute.

C.
The Create Condition Entry Disabled check box is selected.

D.
The escalation has not been linked to an existing application.