In the following question, some part of the sentence may have errors. Find out which part of the sentence has an error and select the appropriate option. If a sentence is free from error, select 'No Error'. Every effect we see, hear or speak in our outside (1)/ or physical world has a specific cause that (2)/ have its origin in the inner or mental world. (3)/ No error (4)?

Option 3 : 3

The correct answer is 3

• If a subject and the verb are joined by a relative pronoun, the verb used will agree with the antecedent to the relative pronoun.
  Example: She is one of the noblest women that has ever lived on the earth. (wrong)
                   She is one of the noblest women that have ever lived on the earth. (right)    
• Cause is singular therefore the verb must also be singular. Therefore we must use 'has' instead of 'have.' So option 3 is the correct answer. 

Thus, the correct answer is: Every effect we see, hear or speak in our outside or physical world has a specific cause that has its origin in the inner or mental world.