Which sentence is in the active voice?

After the fall of saigon, americans a) were eager to explore the lessons of vietnam b) just wanted to forget about the war c)bought airline tickets to hanoi d)demanded that the u. s. get involved in "another vietnam"

Ou work as a cashier for a grocery store and earn $5 per hour. you also mow lawns and earn $10 per hour. you want to earn at least $50 per week, but would like to work no more than 10 hours per week. which system of inequalities, along with y ? 0 and x ? 0, would you use to solve the real-world problem?

Why does yu tsun kill dr. albert at the end of borges’s “the garden of forking paths”?