6. (10 points) There are seven cards, each with a number written on it. When these seven cards are arranged in a row, they form the seven-digit number 2014315. These seven cards are distributed among four people, Jia, Yi, Bing, and Ding, with each person receiving at most 2 cards. Each of them said one thing:
Jia: “If I swap the positions of the two numbers on my cards in the seven-digit number, the new seven-digit number will be a multiple of 8.”
Yi: “If I swap the positions of the two numbers on my cards in the seven-digit number, the new seven-digit number will still not be a multiple of 9.”
Bing: “If I swap the positions of the two numbers on my cards in the seven-digit number, the new seven-digit number will be a multiple of 10.”
Ding: “If I swap the positions of the two numbers on my cards in the seven-digit number, the new seven-digit number will be a multiple of 11.”
It is known that exactly one of the four people is lying. Who is the liar? ( )
A. Jia
B. Yi
C. Bing
D. Ding
【Analysis】If A is telling the truth, then A's cards are 5 and 2, B, regardless of which card, must be telling the truth, if C is telling the truth, then C's cards are 5 and 0, if D is telling the truth, then D's cards are 0 and 3, by observation, it can be found that C contradicts both A and D, it is not difficult to find the liar.

【Solution】Solution: According to the analysis, if A is telling the truth, then A's cards are 5 and 2;
B, regardless of which card, must be telling the truth;
If C is telling the truth, then C's cards are 5 and 0;
If D is telling the truth, then D's cards are 0 and 3;
By observation, it can be found that C contradicts both A and D,
Therefore, the liar is C.
Hence, the answer is: $C$.