How can the sentences below be combined effectively using a conjunction: The girl wandered around the amusement park. She was astonished by the number of people in lines waiting for rides?

The chosen answer effectively combines the two sentences using a conjunction in a way that maintains a smooth narrative flow. By employing "as," the sentence establishes a relationship of simultaneity between the girl wandering around the amusement park and her astonishment at the number of people waiting in lines. This suggests that her feelings of astonishment occurred while she was engaged in the activity of wandering, providing a cohesive sense of experience.

This approach not only creates a stronger connection between the actions but also enhances the overall readability of the sentence, making it more engaging for the reader. The use of "as" implies that her amazement is a reaction to her surroundings, enriching the context and making the imagery more vivid.

Other options either use contrasting conjunctions or separate the ideas with punctuation, which can create a choppier reading experience. The answer chosen effectively captures the relationship between the actions with clarity and fluidity.