sounds like a homework question?
a change in preferences or income would shift demand. an increase an income might shift the demand for oranges (and other normal goods) outwards.
a change in technology (the production function) or input prices might shift the supply curve. for example, if the price of labor increases, then the supply curve for a particular good might shift inward.
the important thing to remember is that changes in quantities supplied and demanded are movements *along* given supply and demand curves, but not shifts in the curves themselves. thats probably the point of this problem.
Ambition is a dream with a V8 engine - Elvis Presley
I've always understood that concept, but I've never seen it written out like that for some reason. That's really interesting.