Choose the part of the sentence that has an error :
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → who I have discovered
The relative pronoun who is used for persons; for things it is which or that.
Option 1: There are fifteen causes of failure — No error.
Option 2: who I have discovered — Error. "Who" refers to causes, which are things, so it should be which (or that).
Corrected: which I have discovered
Option 3: and I'm going to give them to you — No error.
Option 4: with a brief comment on each one — No error.
Correct sentence: There are fifteen causes of failure which I have discovered and I'm going to give them to you with a brief comment on each one.
Example: This is the book which I bought yesterday.