EACH of these statements CAN be true or false.  They ALL depend on the situation, and on the components of the particular circuit.  
For each of these statements, I can give you the diagram of a circuit in which the statement is true, and I can give you the diagram of another circuit in which the same statement is false.
<u>These choices are usually true:</u>
-- Changing the frequency does not affect the current. 
-- Increasing the resistance decreases the current. 
-- Increasing ΔVmax increases the current.  
<u>These choices are usually false:</u>
-- Increasing the frequency increases the current. 
-- Changing ΔVmax does not affect the current. 
-- Changing the resistance does not affect the current.  
-- Increasing ΔVmax decreases the current. 
-- Increasing the resistance increases the current. 
-- Increasing the frequency decreases the current. 
<u>These choices can go either way just as easily:</u>
-- Voltage leads current. 
-- Current and voltage are in phase. 
-- Current leads voltage.