The explicit information that best supports the inference that "The VO has to be very selective with their produce for their concerts" is the statement that "When the VO hits the road, the vegicians occasionally pack produce in their suitcases in case they can't get the ones they need out of town." This suggests that they need to be careful and selective about their produce choices to ensure they have the right items for their performances, particularly when traveling.
Therefore, the answer is "All of the above."