How many rearrangements of a b c d are there in which no two adjacent letters are also adjacent letters in the alphabet? For example, no such rearrangements could include either a b or b a.

**Answer Choices**

A. 0

B. 1

C. 2

D. 3

E. 4

How many rearrangements of a b c d are there in which no two adjacent letters are also adjacent letters in the alphabet? For example, no such rearrangements could include either a b or b a.

**Answer Choices**

A. 0

B. 1

C. 2

D. 3

E. 4