Suyash starts walking from his office and walks 40 m towards the south. From there, he turns right and walks 35 m, and then he turns right again and walks 70 m. Finally, he turns right one more time and walks 75 m to reach his home. What is the shortest distance between his office and his home?

A

40 m

B

50 m

C

70 m

D

85 m