Final answer:
In the given context the word 'course' refers to a person's life path or direction, which can be influenced significantly by love. The correct definition of 'course' in this passage is 'pathway'. Option a is correct.
Step-by-step explanation:
The quote 'And think not you can direct the course of love, for love, if it finds you worthy, directs your course' suggests that "course" here refers to a person's path or direction in life. This quote points to the idea that love has the power to change the direction of a person's life path in a significant way. The word "course" in this context is best defined as 'pathway'.
When people make choices in life, they often refer to the metaphor of taking a path or a course, indicating direction and progression. This is evident from phrases like 'He took the wrong path in life' and 'When I left home, I came to a crossroads in life.' Hence, in the context of the passage, the word 'course' refers to the figurative journey through life, shaped by love's intervention.