Read the sentence, and then identify its error by selecting the appropriate answer choice. The British Prime Minister who is visiting the U.S. this week, is extremely charismatic and intelligent?
1) No error
2) The British Prime Minister who is visiting the U.S. this week, are extremely charismatic and intelligent.
3) The British Prime Minister who is visiting the U.S. this week, am extremely charismatic and intelligent.
4) The British Prime Minister who is visiting the U.S. this week, is extremely charismatic and intelligent.