The process of producing energy by utilizing heat trapped inside the earth surface is called _________
 
(a) Hydrothermal energy
 
(b) Geo-Thermal energy
 
(c) Solar energy
 
(d) Wave energy
 
This question was posed to me in unit test.
 
Asked question is from Geothermal Energy in chapter Ocean Energy & Geothermal Energy of Energy Engineering
Select the correct answer from above options 
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