Explanation
Correct answer: B.
Choice B is the best answer. The passage tells us that attendees at Johnson’s get-togethers "would read and discuss one another’s work." This suggests that the gatherings could provide an opportunity for Johnson to get feedback on her plays. Notice how the text foreshadows this conclusion by the mention of Johnson learning "what other people thought of her plays."
Why the other choices are wrong
Choice A
Choice A is incorrect. The passage doesn’t mention theater companies attending the get-togethers, so there is no basis for this inference.
Choice C
Choice C is incorrect. The passage doesn’t mention learning about plays from other cities, so there is no basis for this inference.
Choice D
Choice D is incorrect. The passage doesn’t mention Johnson using the get-togethers as inspiration for future plays, so there is no basis for this inference.