Task: Question Answering
Input (English): Problem: each digit 1 through 5 is used exactly once to create a 5 - digit integer. if the 3 and the 4 can not be adjacent digits in the integer, how many 5 - digit integers are possible ?
Options: a. 48, b. 66, c. 72, d. 78, e. 90
Output (English): c