Question

The internal, or geothermal, (1)/heat from within the Earth are (2)/ responsible for the fact that (3)/temperature increases with depth (4).

Read each sentence to find out whether there is any grammatical error in it. The error, if any, will be in one part of the sentence. Mark the part with the error as your answer. If there is no error, mark ‘No error’ as your answer (Ignore the errors of punctuation, if any).
A 1
B 2
C 3
D 4
E No error
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