Logic/ math question


the answer is D, how is this one solved?

Let’s call the competitors:
B → A,Mar,L,R,G,Mat (6×5=30 matches)
A → Mar,L,R,G,Mat (5×5=25 matches)
Mar → L,R,G,Mat (4×5=20 matches)
L
R
G
Mat

With writing the rest of them we can say this is the trend: 30+25+20+15+10+5=105

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