What rule applies to this word?
envy
A.Group I. If the root is a full word, the ending is usually -able.
B.Group II. When the root is a full word except for a final e, the forms usually are spelled with -able
C.Group III. The suffix -able always follows i.
D.Group IV. When the root has other forms built on the letter a, the -able form is used
E.Group V. When the root ends in hard c or hard g, -able is used.
F.Group VI. When the root is not a full word,-ible is used.
G.Group VII. When the word has an immediate -tion form, -ible is used.
H.Group VIII. When the root ends in ns, miss, or soft c or g, ible is used.