You will be given a definition of a task first, then some input of the task.
In this task, you're given a question, a context passage, and four options which are terms from the passage. After reading a passage, you will get a brief understanding of the terms. Your job is to determine by searching and reading further information of which term you can answer the question. Indicate your choice as 'a', 'b', 'c', or 'd'. If you think more than one option is plausible, choose the more probable option to help you answer the question.

Question: What city did Lagunette race in on June 13th? Passage:Lagunette finished fourth over 2000 metres on her first appearance as a three-year-old and was then moved up in distance to win the Prix de Tuileries over 2400 metres at Longchamp Racecourse. The filly was then dropped back in distance and moved up sharply in class for the Group One Prix de Diane over 2100 metres at Chantilly Racecourse on 13 June. Starting a 28/1 outsider, she finished third behind Pawneese (winner of The Oaks) and Riverqueen (Poule d'Essai des Pouliches) but ahead of Sarah Siddons (Irish 1000 Guineas) and Theia (Criterium des Pouliches). Lagunette was then sent to Ireland for the Irish Oaks over one and a half miles at the Curragh on 17 July and started 3/1 second favourite behind Acoma who had won a minor race at Saint-Cloud Racecourse by six lengths on her only previous start. Sarah Siddons was third choice in the betting in an eighteen runner field which alo included the Vincent O'Brien-trained I've A Bee, the Cheshire Oaks winner African Dancer, the Oaks d'Italia winner Claire Valentine and the Lupe Stakes winner Laughing Girl. Paquet had problems obtaining a clear run when switching the filly to the outside inside the final quarter mile but Lagunette accelerated in the closing stages and won by two lengths from Sarah Siddons with I've A Bee half a length away in third place.
Links: a. Chantilly Racecourse b. Pawneese c. Saint-Cloud Racecourse d. Chantilly Racecourse
Output:
a