A word and number arrangement machine when given an input line of words and numbers rearranges them following a particular rule in each step. The following is an illustration of input and rearrangement.
Input: go now 53 39 18 for again 66
Step 1 : 66 go now 53 39 18 for again
Step 2 : 66 again go now 53 39 18 for
Step 3 : 66 again 53 go now 39 18 for
Step 4 : 66 again 53 for go now 39 18
Step 5 : 66 again 53 for 39 go now 18
Step 6 : 66 again 53 for 39 go 18 now

Q:

Input: trees 18 27 desk are 91 hour zero 31 16 chairs.
Which of the following will be step 4?

• 1
  91 are 31 trees 18 27 desk hour zero 16 chairs
• 2
  91 trees 18 27 desk are hour zero 31 16 chairs
• 3
  91 are 31 chairs trees 18 27 desk hour zero 16
• 4
  91 are 31 chairs 27 desk 18 trees hour zero 16