Choose the option nearest in meaning to the underlined word(s).
If joy hadn't been tripped up halfway through the race, she would have come first.
Answer Details
The phrase "tripped up" in this context means to stumble or fall, causing a delay or disruption in progress. Therefore, the option that best captures the meaning is "interrupted". If Joy hadn't been interrupted, she would have won the race.
Here's an example to illustrate the meaning:
If I hadn't been tripped up by a sudden phone call, I would have finished my work on time.