$$11$$，$$13$$，$$17$$，$$31$$，$$37$$，$$71$$，$$73$$，$$79$$，$$97$$． 
A two-digit prime number is still a prime number when its first and tenth digits are exchanged. There aresuch prime numbers. 

A: $$6$$ 
B: $$7$$ 
C: $$8$$ 
D: $$9$$ 
E: $$10$$ 