Uncertainty propagation requires nominal values for relative errors Steps:

• Identify the formula for energy: E = V² t / R.
• Use maximum absolute uncertainty: δE = E [2 (δV / V) + (δt / t) + (δR / R)].
• Note given uncertainties: δV = 0.40 V, δt = 0.30 s, δR = 10.0 Ω.
• Nominal V, t, R needed for ratios, but not provided with E = 0.50 J.

Not enough information.

Why D is correct:

• D is listed, but calculation impossible without nominal values to compute relatives.

Why the others are wrong:

• A, B, C also impossible to verify due to missing nominal values.

Final answer: Not enough information.