With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: Opinions on the devil, and his relationship to the Demiurge, varied. The Ophites held that he and his demons constantly oppose and thwart the human race, as it was on their account the devil was cast down into this world. According to one variant of the Valentinian system, the Demiurge is also the maker, out of the appropriate substance, of an order of "spiritual" beings, the devil, the prince of this world, and his angels. But the devil, as being a "spirit" of wickedness, is able to recognise the higher spiritual world, of which his maker the Demiurge, who is only animal, has no real knowledge. The devil resides in this lower world, of which he is the prince, the Demiurge in the heavens; his mother Sophia in the middle region, above the heavens and below the Pleroma.
text_B: Did the Ophites believe the devil and his demons were frustrating humans?
YES.