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Answer:
Krogstad tries to Blackmail Nora into getting Helmer to keep him at the bank by exposing her forgery.
The answer: " -ible"
The word is: "exhaustible" .
Group: VII .
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The following rule applies, as mentioned within the question, and as quotated DIRECTLY from THIS VERY QUESTION:
"<span>Group VII. When the word has an immediate -tion form, -ible is used.</span>"
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Note: The word, "exhaust" ; does, in fact have an "immediate -tion form" ;
since the word, "exhaust" ; ends with the letter, "t" ; and since the word, "exhaust" ; has an "immediate -tion" form, which is the word, "exhaustion" ; then "Group VII" applies.
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The word is "exhaustible" ; (note that the ending is: "-ible").
Group: VII .
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