Answer:
The correct answer would be, Self Dealing.
Step-by-step explanation:
Self Dealing is a concept of loyalty in which the trustee, partner, attorney, stakeholder, etc would take advantage of his position in a transaction that is going to take place by the firm in which he is the partner and act in his own interests rather than acting in the interests of the beneficiaries of the firm.
This is exactly the situation in this question, where Daria is a partner in a partnership firm which is looking for a piece of land, and Daria owns a land and sells it to them without bringing this thing in their notice that this land belongs to her. This would be considered a breach of duty of loyalty, which is termed as Self Dealing.