Final answer:
According to Davey, what can't be done without changing the rules? The president can't be nominated without changing the rules.
Step-by-step explanation:
According to the information provided, the subject of this question seems to be politics or government. The statement 'According to Davey, what can't be done without changing the rules?' implies that there are certain actions that require changes in the rules. Among the given options, the correct answer would be B) The president can't be nominated without changing the rules. This is because the process of nominating and electing a president follows specific rules set by the Constitution.