Correct option is A. $$\lambda >\frac{hc}{W_0}$$
$$\begin{array}{l}k_{\max }=h v-\phi \\\text { Since there is no photo-electric effect } \\\therefore h v\phi<0 \\\frac{h c}{\lambda_{b}}-w_{0}<0 \\W_{0}>\frac{h c}{\lambda}\Rightarrow\left[\lambda>\frac{h c}{\omega_{0}}\right]\end{array}$$