12. (12 points) December 21, 2013 was a Saturday, so the Spring Festival of 2014, which is January 31, 2014, is a ( )
A. Monday
B. Thursday
C. Friday
D. Saturday
【Answer】Solution: $10+31=41$ (days)
$$
41 \div 7=5 \text { (weeks) } \cdots 6 \text { (days) }
$$

The remainder is 6, so 6 days from Saturday is Friday.
Answer: January 31, 2014 is a Friday.
Therefore, the correct choice is: $C$.