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Which of the relationship is correct in Permanent magnet DC motor?

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Which of the relationship is correct in Permanent magnet DC motor?

(a) T ∝ (Ia)^2

(b) T ∝ (Ia)^0

(c) T ∝ Ia

(d) T^2 ∝ Ia

I had been asked this question by my school teacher while I was bunking the class.

Query is from Solar Powered Pump Drives in section Solar and Battery Powered Drives of Electric Drives

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Right answer is (c) T ∝ Ia

To elaborate: The value of flux remains constant in Permanent magnet DC motor. The torque in the PMMC motor is directly proportional to the armature current.

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