Paco's teacher has asked him to add a transition in the introduction to his argumentative essay in favor of abolishing tuition at public colleges. (1) Today, even many blue-collar, retail, and clerical jobs require applicants to have a college degree. (2) , going to college—even a public college—is becoming more and more expensive. (3) What's a student with little money to do? (4) The only way to make higher education accessible to students with low incomes is to abolish tuition at public colleges.

Which expression should be added to sentence 2 to best clarify the relationships among Paco's ideas?

Additionally
Although
Similarly
However