Final answer:
The best estimate of the total number of visitors to the 4H booth during the 4 days is 600.
Step-by-step explanation:
The best estimate of the total number of visitors to the 4H booth during the 4 days can be determined by looking at the given options and selecting the most reasonable estimate. In this case, option c) 600 would be the best estimate as it falls in the middle range of the given options. While there is not enough information provided to calculate the exact number of visitors, the estimate of 600 seems the most likely based on the given choices.