A torque starts a flywheel

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Problem: A torque starts a flywheel
A flywheel with moment of inertia 0.80 kg·m² experiences a net torque of 4 N·m.
Question: Find its angular acceleration.
Givens:
- I = 0.80 kg·m²
- τ = 4 N·m
Assumptions: Rigid flywheel about a fixed principal axis; stated torque is net torque; moment of inertia constant.
Choices (LaTeX):
A. 0.2\ \mathrm{rad\,s^{-2}}
B. 4\ \mathrm{rad\,s^{-2}}
C. 5\ \mathrm{rad\,s^{-2}}
D. 3.2\ \mathrm{rad\,s^{-2}}

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Tutoring approach:
Act as a patient physics tutor. Ask what I understand and what I have tried, then wait for my reply. Teach one step at a time; do not give the final answer or a complete solution immediately. Start with a physical picture. Define unfamiliar symbols and operators, explain signs and units, and state the model's assumptions. Give progressively stronger hints only when I need them. Ask me to predict a change before calculating it. When I finish, help me check dimensions and a limiting case, then ask one related transfer question. If information is missing or ambiguous, ask rather than inventing it. Distinguish exact results from approximations and acknowledge uncertainty.