Comprehension Passage

There are three series is given in each series a variable i.e. A, B, C is missing.

Series 1: 1200, 600, 200, 50, 10, A

Series 2 : 200, 300, 120, 180, 72, B

Series 3: 75, 87, 72, 81, 72, C

Find the correct relation between A, B and C ?

A >B < C

B > C > A

B = C > A

B < C = A

None