This question is testing PARALLELISM.
We have a list structure, so we need to make sure all of the elements in our list are parallel. Whenever we have a list with infinitives, we have two options:
1) Use the "to" every time: I like to dance, to sing, and to paint
2) Use the "to" only for the first list element. It is implied that it will apply to all other list elements: I like to dance, sing, and paint.
We are NOT allowed to drop the "to" for the 2nd element,
...
We have a list structure, so we need to make sure all of the elements in our list are parallel. Whenever we have a list with infinitives, we have two options:
1) Use the "to" every time: I like to dance, to sing, and to paint
2) Use the "to" only for the first list element. It is implied that it will apply to all other list elements: I like to dance, sing, and paint.
We are NOT allowed to drop the "to" for the 2nd element,
...



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