Figure shows a circular area of radius R where a uniform magnetic field B is going into the plane of paper and increasing in magnitude at a constant…

Figure shows a circular area of radius R where a uniform magnetic field $\displaystyle \vec{B}$ is going into the plane of paper and increasing in magnitude at a constant rate. In that case, which of the following graphs, drawn schematically, correctly shows the variation of the induced electric field E(r) ?