Use Heisenberg's uncertainty principle.For example \\\\([\\Delta x = \\dfrac{h}{{4\\pi m\\Delta v}}]\\\\)Here, \\\\(\\Delta x\\\\) is the uncertainty in the position.\\\\(\\Delta v\\\\) is the uncertainty in velocitym is the mass of Particle.Given,\\\\(m = 40g = 0.04kg\\\\)\\\\(\\Delta v = 2\\% {\\rm{ of }}v = 2 \ imes \\dfrac{{45}}{{100}}{\\rm{ = 0}}{\\rm{.9}}m/s{\\rm{ }}\\\\)\\\\(h = 6.626 \ imes {10^{ - 34}}J.s\\\\)Now,\\\\(\\Delta x = \\dfrac{{6.626 \ imes {{10}^{ - 34}}}}{{\\left( {4 \ imes 3.14 \ imes 0.04 \ imes 0.9} \\right)}}\\\\)\\\\(= {1.4654\ imes10^{ - 33}}m\\\\)So, the correct option is \\\\(C\\\\)