My granddaughter recently completed the following economics lesson for her grade 2 class:
The lesson has the right idea: don't reason from a price change but instead ask, "What might change to cause prices to change?"
It also asks the students to analyze what might cause a shortage at the current price [at least I think that's what the question means when it asks about what might cause oranges to become scarce.]. And then it asks what might happen to the price after the shortage at the original price occurred.
In this case, my granddaughter offered the possibility of a reduction in the supply of oranges; I hope the teacher (or more likely the teachers' manual) would also accept some change such as "People begin to believe that oranges make you healthier," thus shifting the demand curve rightward rather than shifting the supply curve leftward. Either would cause an increase in the price (unless you live in Venezuela or some other jurisdiction where prices are kept artificially low by gubmnt fiat).
Addendum: I forgot to put this in the original post. I might also want to put in a question about whether people will want to buy more or fewer oranges when the price goes up.