little finger , with atrophy of the hypothenar muscles , EMG showed cubital tunnel compression of the ulnar nerve.. Ulnar nerve decompression

little finger , with atrophy of the hypothenar muscles , EMG showed cubital tunnel compression of the ulnar nerve , what is your action now:
A. Ulnar nerve decompression.
B. Steroid injection.
C. CT scan of the spine.
The correct answer is a