Answer:
d
Explanation:
I chose this answer because it has two dependant clauses (she would swim for an hour) and then (she would bike for two hours.) Im sorry if this diddnt help I truly tried my best.
That sentence is an example of parallel structure.
When there is repetition of a specific grammatical form in a sentence, parallelism or a parallel structure is produced. This occurs when you mantain the same pattern for every compared word or idea in your construction. This makes the idea easier to follow by the reader.
A) toilsome
Toilsome: characterized by effort to the point of exhaustion; especially physical effort