The uncertainty principle was discovered by Heisenberg. It states that ΔpΔx ≥ h where Δp is the uncertainty in knowing the momentum of the particle (momentum equals mass times velocity), Δx is the uncertainty in knowing the position of the particle, and h is Planck's constant (h=6.63×10⁻ ³⁴Js). If we know very precisely the position of the particle, we will not be able to know its speed so precisely and vice versa, regardless of how good our measuring device is.
So the answer is option d)