A Bank Positions Itself Using Its Deposit Safety Attribute

A bank positions itself using its deposit safety attribute.Why would this positioning not create an impact in the consumer's mind?

A) Because consumers can consider only those attributes of which they are aware.
B) Because the positioning effort was kept too simple and complexity was not included.
C) Because the importance attached to the deposit safety attribute is large and uniform across various consumers.
D) Because all the alternative brands are perceived to be about equal on that dimension.