Which of the following integers are less than -9?
-11, -12, -151, -121, -11111, -12121212, -1345, -1111123
-10,-11,-12,-13,-14,,-15,-16,-17,-18,-19,-20.......and so on are less than -9.
Hence, from the given options
-11, -12, -151, -121, -11111, -12121212, -1345, -1111123 are all less than -9.