Half an hour after $6:30$ is $7:00$  $7+1=8$ 
Vansen left for school at $6:30$ am. He took half an hour to walk from his house to school. Ron reached school $1$ hour later than Vansen. At what time did Ron reach school? (adapted from 2009 Math Kangaroo Problem, Level 3-4, Question \#8) 
(A) $7:00$ am. 
(B) $8:00$ am. 
(C) $8:45$ am. 
(D) $9:00$ am. 
(E) $10:00$ am. 