The work functions for metals A, B and C are respectively $1.92\: eV, 2\: eV \: and \: 5 \: eV$. According to Einstein’s equation, the metals which will emit photoelectrons for a radiation of wavelength $4100\: A^{\circ} $ is / are

Question

$\begin {array} {1 1} (a)\;None & \quad (b)\;A\: only \\ (c)\;A\: and \: B \: only & \quad (d)\;all\: the\: three \: metals \end {array}$