Which of the following is true about magnetic poles?
a. like poles repel each other, and opposite poles attract each other.
b. like poles attract each other, and opposite poles repel each other.
c. like poles attract each other.
d. opposite poles repel each other.

A. because  the like pole of the inner magnet would be attracted to orienting towards the like pole,  The solenoid opposites attract. the main difference between a bar magnet and a solenoid is that there isn't the hollow interior of a bar magnet where "like poles attract". i stand corrected.