Final answer:
The word that best fits the description of having sound judgment, being perceptive and wise is 'sagacious'. The other options do not correspond with the given definition.
Step-by-step explanation:
The question is asking for a word that describes someone who has sound judgment, is perceptive, and wise. The best choice among the options given is sagacious, which means having or showing keen mental discernment and good judgment; being shrewd. It is associated with someone who is wise and able to make good decisions. The other options do not align with the given definition. 'Scrumptious' refers to food that is delicious, 'scathing' implies harsh and critical comments, and 'serendipitous' means occurring or discovered by chance in a happy or beneficial way.