A current loop, having two circular arcs joined by two radial lines is shown in the figure. It carries a current of 10 A. The magnetic field at point O will be close to:

A

$$1.5 \times 10^{-7}$$ T

B

$$1.0 \times 10^{-7}$$ T

C

$$1.5 \times 10^{-5}$$ T

D

$$1.0 \times 10^{-5}$$ T