<image 1> What seems to be the issue with this young citrus tree?
['Mineral deficiency', 'Nematode attack', "Don't know and don't want to guess", 'There is no problem', 'Pot bound']
The correct answer is:
Pot bound: 
This plant had outgrown its pot, the lateral roots appear healthy, but the main root growing down doubled back when it could not penetrate the base of the pot.