The teacher kept track of how long it took students to finish a test. After 20 minutes, 3 students had finished the test.
How many students were finished after 70 minutes?
A. 10

B. 9

C. 7

D. 8

P.S. I will mark you brainliest if you are correct! Also, I can't mark you brainliest if there's only one answer. I need two! Thank you.