Final answer:
In "Laustic" by Marie de France, the romance strategy used is Courtly Love, characterized by a knight's dedicatedly platonic adoration for a lady, within a noble and unattainable framework, symbolized by the nightingale.
Step-by-step explanation:
The romance strategy used in "Laustic" by Marie de France is Option 2: Courtly Love. The narrative revolves around a knight who engages in a chivalric and dedicatedly platonic love affair with a married lady. This representation aligns well with the traditions of courtly love, which began in areas of present-day France during the 11th century and often involved noble knights expressing love for ladies in a manner that was noble and unattainable. In "Laustic," the nightingale serves as a symbol of the love between the knight and the lady, which further strengthens the romantic connection and honor associated with courtly love. Moreover, literature from the court of King Arthur frequently explores themes of courtly love, which is crucial in understanding the cultural and historical context fueling Marie de France's literary choices.