Detailed Instructions: In this task, a passage will be given and the goal is to generate a question about temporal relations based on that passage. A temporal relation describes the relation between two things with respect to time e.g., something happens/starts/terminates/... immediately/shortly/usually/... before/after/during/... something else.
Your question should include an event, or ask about an event, and should not be a yes/no question.
Q: Passage: Acquisition has launched a suit in a Delaware court seeking the withdrawal of Dunkin's poison pill rights and employee stock ownership plans, which it claims were put in place to deter bidders. Acquisition said 2.2 million shares, or about 38.5% of the shares outstanding, have been tendered under its offer.
A:
What event has already happened?