With no explanation, label text_A→text_B with either "False" or "True".
text_A: I was trying to open the lock with the key, but someone had filled the  keyhole with chewing gum, and I couldn't get it in. The it is more likely to refer to The key than chewing gum because I was trying to open the lock with the key, but someone had filled the keyhole.
text_B: In "I was trying to open the lock with the key, but someone had filled the  keyhole with chewing gum, and I couldn't get it in. ", The it is more likely to refer to The key than chewing gum because I was trying to open the lock with the key, but someone had filled the keyhole.
True.