(1) While you might think that you see or are aware of all the changes that happen in your immediate environment, there is simply too much information for your brain to fully process everything.
(3) It cannot be aware of every single thing that happens in the world around you.
(4) Sometimes big shifts happen in front of your eyes and you are not at all aware of these changes.
(2) Psychologists use the term ‘change blindness’ to describe this tendency of people to be blind to changes though they are in the immediate environment.
So, the correct option is (B): 1342.
1 and 3 naturally connect, with the "It" in sentence 3 referring back to the "brain" discussed in statement 1. Similarly, 4 and 2 naturally link together, as the "this tendency" in statement 2 refers to the inclination of people to ignore events occurring in front of them, as discussed in statement 4.
So, the correct option is (B): 1342.