What is the most efficient way to ensure a value is selected every time a record is saved?

A custom picklist field, Food_Preference__c, exist on a custom object. The picklist contains the following options: ‘Vegan’,’Kosher’,’No Preference’. The developer must ensure a value is populated every time a record is created or updated.

What is the most efficient way to ensure a value is selected every time a record is saved?
A . Set "Use the first value in the list as the default value" as True.
B . Set a validation rule to enforce a value is selected.
C . Mark the field as Required on the field definition.
D . Mark the field as Required on the object’s page layout.

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Answer: C