Answer: A and C
B and D is incorrect because these are not the closest sides of the moon. B and D would have low tide, not high tide. If the moon were positioned above B or D, then both B and D would have high tides.
D and C is incorrect because the moon pulls the closest and furthest sides into high tide. Only C would have high tide, D on the other hand would be low tide.
A and B is incorrect because the moon pulls the closest and furthest. B would not have a high tide because of it's position; it would have a low tide.
A and C is correct because the moon uses it's tidal force to pull the tide on the furthest and closest sides of the moon, and A and C are the furthest and closest sides.