Field where choices can only be used once - please help!

[cynlink1]

I have been asked to create multiple choice list fields where the choice options can only be used once similar to rating lunch options in order of preference. You cannot have two first preferences.

Lunch          My Preferences

Chicken	Second preference
Beef	Third preference
Veg	First preference

I need to create a input method to capture data similar to the table below. In each column, each value must be unique. For instance, users should not be able to rate Cost as the 'Highest' for both Avoid and Mitigate.

I was planning to create a new table to store records representing each row (Avoid, Mitigate, Transfer, Accept) and then creating fields (columns) for the various ratings (Cost, Disruption, Ability to Implement, etc.) 

Few questions for the community:

1.) In a parent/child relationship, is it possible to restrict the use of a choice option once it has been used in another child record? 

2.) If you have ever fulfilled a similar requirement, what did you works the best. I am open to any idea you are willing to share.

3.) Is it possible to create a chart like the example below on the parent form to capture the users ratings and ultimately use the rating values to derive priorities?  

	Cost	Disruption	Ability to Implement	Effectiveness	Efficiency
Avoid	Highest	Most Disruptive	Highest	Highest	Highest
Mitigate	Second Highest	Second Most Disruptive	Second Highest	Second Highest	Second Highest
Transfer	Second Lowest	Second Least Disruptive	Second Lowest	Second Lowest	Second Lowest
Accept	Lowest	Least Disruptive	Lowest	Lowest	Lowest

[cynlink1]

@Ankur Bawiskar - Would you be willing to provide some of your expert MVP advice for my question? Thanks in advance!