A small sphere of radius ' \( r \) ' falls from rest in a viscous liquid. As a result, heat is p...

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A small sphere of radius ' \( r \) ' falls from rest in a viscous liquid. As a result, heat is produced due to viscous force. The rate of production of heat when the sphere attains its terminal velocity, is proportional to
[NEET 2018]
(a) \( r^{3} \)
(b) \( r^{2} \)
(c) \( r^{5} \)
(d) \( r^{4} \)
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