A part of the sentence may or may not have an error. Find out which part has an error and mark that part as your answer. If there are no errors, mark 'No error' as your answer. This historic church has been sanctified by the prayers and praises of countless thousands who has worshipped within its walls.?

Option 3 : has worshipped within its walls.

The correct answer is- 'who have worshipped' should be there in place of 'who had worshipped'

• In the case of the relative pronoun, the verb used after it will be according to the 'antecedent' of it which is 'thousands' here. So the verb should be plural.
• Example: It is not the employees, but the CEO, who decide the issue. (wrong)

                           It is not the employees, but the CEO, who decides the issue. (right)

The correct sentence is: 'This historic church has been sanctified by the prayers and praises of countless thousands who have worshipped within its walls.'