Answer:
option d - I passed my test after studying for a week. Yay!
Step-by-step explanation:
because in all the other ones there is a comma before a capital, capital letter only come for special things like names or places or the beginning of a new sentence. A capital is required after a period, so it wasn't any of the lowercase one. Also using an interjection was required for this, so that made option d the best.