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Which of these relations is applicable for turbulent and laminar boundary layer?

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Which of these relations is applicable for turbulent and laminar boundary layer?

(a) δTturbulent < δTlaminar

(b) δTturbulent = δTlaminar

(c) δturbulent < δlaminar

(d) δturbulent > δlaminar

This question was posed to me in homework.

This key question is from Boundary Layer Properties in chapter Boundary Layers, Laminar & Turbulent Boundary Layers, Navier Stokes Solutions of Aerodynamics

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The correct option is (d) δturbulent > δlaminar

To explain: In case of turbulent flow, there is a high energy and momentum exchange compared to the laminar flow due to the presence of eddies. This leads to the thermal and velocity boundary layer thickness of the turbulent flow to be higher than that of the laminar flow. Thus, δturbulent > δlaminar and δTturbulent > δTlaminar.

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