What is the codefor 'the dog was frightened’?

'816321' means "The brown dog frightened the cat”,
‘64851' means "The frightened cat ran away”,
‘7621' means "The cat was brown",
'341' means "The dog ran"

All statements have the word "the" and all codes have "1"
Hence, "the" = 1

Sentences 1,2,3 have "cat" in common and the only common number in all 3 codes is 6
Hence, "cat"= 6

Statements 1 and 2 have frightened in common and only "8" left unassigned.
Hence, "frightened" = 8

From statements 1 and 3 we can say that only brown is left common and "2" is unassigned common number.
Hence, "brown" = 2
Consequently, "was" = 7

From statements 1 and 4, dog will stand for "3" as "the" has already been assigned 1.
Hence, the statement 'the dog was frightened’ will be coded as: 1-3-7-8 in any order. 
This is reflected in option B