Final answer:
The sentence that best follows the interjection 'Hurray!' is 'We won the cheer dance competition!'
Step-by-step explanation:
The sentence that BEST follows the interjection Hurray! is d) "We won the cheer dance competition!"
When someone says "Hurray!", it is usually an expression of excitement or joy. The sentence "We won the cheer dance competition!" reflects this feeling of celebration and achievement, making it the best choice to follow the interjection.