Two strips of metal are riveted together at their ends by four rivets, each of diameter 6 mm. Assume that each rivet is to carry one quarter of the load. If the shearing stress on the rivet is not to exceed `6.9xx10^7Pa`, the maximum tension that can be exerted by the riveted strip is
A. `2xx10^3N`
B. `3.9xx10^3N`
C. `7.8xx10^3N`
D. `15.6xx10^3N`