Two wires `W_(1) "and"W_(2)` have the same radius r and respective densities `p_(1) "and" p_(2)` such that `p_(2) = 4p_(1).` They are joined together at the point O, as shown in the figure. The combination is used as a sonometer wire and kept udner tension T. The point O is midway between the two bridges. When a stationary waves is set up in the composite wire, the joint is found to be a node. The ratio of the number of antinodes formed in `W_(1) "to" W_(2)` is-
A. `4:1`
B. `1: 2`
C. `1:1`
D. `1:3`