In a tournament 14 teams play league matches. If each team plays against every other team once only then how many matches are played?

To find the total number of matches in a league where every team plays every other team once, we use the combination formula for selecting 2 teams out of 14. The formula is n times n minus 1 divided by 2. In this case, n is 14. So, the calculation is 14 times 13 divided by 2. 14 times 13 equals 182. 182 divided by 2 equals 91. Therefore, 91 matches are played in total. Option B is the correct answer.