ANSWER: Group II. When the root is a full word except for a final e, the forms usually are spelled with -able.
EXPLANATION: The word will be Deplorable. -able will be used with the word 'Deplor-'. The Group II is when the root is a full word except for a final e, the forms usually are spelled with -able is used for the word Deplor- because the word Deplor- has 'e' at the end of it.