Option B: As seen in the given letter, there is no gap between the receiver's designation 'The Secretary' and the receiver's address 'Hall School of Design...W4 4LJ'
Hence B is correct.
Option A: There can be seen a gap between the sender's address (top right corner) and the date '22 December 2007'. Hence A is incorrect.
Option C: There is always a gap between the salutation and the subject. Hence C is incorrect. (Also, sometimes the subject is not used in a letter.)
Option D: In some letters, the person may or may not sign at the end. But, the designation of the sender is mentioned after the closing salutation. In that case, there is a gap between the two. Hence D is incorrect.