Final answer:
The line that best expresses the opinion that losing to Breca was worth it is option c. 'Defeat to Breca opened the sea-road for sailors without any hindrance.'
Step-by-step explanation:
The line that best expresses the opinion that losing to Breca was worth it is option c. 'Defeat to Breca opened the sea-road for sailors without any hindrance.' This line suggests that despite the loss to Breca, the defeat actually led to a positive outcome of opening the sea-road for sailors without any obstacles. It implies that the defeat was necessary for the future success of sailors crossing the sea.