Air at pressure P1 is injected to a manometer with a tube size of 2 cm diameter and air at pressure P2 is injected to another manometer with a tube size of 4 cm diameter as shown in the figure.
Which of the following options about P1 and P2 is true?
A P1 = P2
B 2P1 = P2
C 4P1 = P2
D P1 = 4P2

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