Help me please!!! Please explain me the easiest way to do this! Thanks!

Man Friday wrote down in a row several different positive integers less than 11. Robinson Crusoe examined these numbers and noticed with satisfaction that, in each pair of adjacent numbers, one of the numbers is divisible by the second one. At most how many numbers did Man Friday write down?

A) 6

B) 7

C) 8

D) 9

E) 10