Considering the legal implication, the option that will involve a lawsuit is "Material breach of contract."
A material breach of contract is the legal term used to describe the kind of breach of contract condition or situation that would render the entire contract useless or undoable and it's punishable by law.
An excellent example of a Material breach of contract is when a seller has agreed to sell and collect money but later refuses to sell to the buyer again.
Hence, in this case, it is concluded that the correct answer is option D. "Material breach of contract."
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