Answer:
The team not only practicing at 6 a.m. during the week, but it also scrimmages on Saturday afternoons.
Step-by-step explanation:
A parallel structure is presented in a sentence when the author of that sentence uses the same pattern of words to show two ideas of the same importance in a single sentence.
All the phrases shown in the question above presented parallelism as a structure, however, the option selected above uses this structuring more efficiently, as it not only manages to establish both ideas, but presents a coherent and cohesive sentence with all the words established in one correct order and with the punctuation correctly placed, making the whole sentence clear and grammatically perfect.