Hey there Icyunvkayy,
Answer:
A, Chipas
Hope this helps :D
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La (primera) cosa que hago es despertarme temprano.
Lo (segundo) que hago es levantarme.
Lo (tercero) que hago es ir al baño. Lo (cuarto) es bañarme.
The indefinite article would be el which is he in spanish because it ends with an o which means it is a male item