In the following passage some of the words have been left out. Read the passage carefully and select the correct answer for the given blank out of the four alternatives.
National integration means ___(1)__ all the people of the nation into a single whole. It is a __(2)___ that bends together all people in one __(3)___ bond no matter what their religion, caste, language or history may be. It is a __(4)___ cementing force whereby all kinds of people live __(5)___ peacefully and can identify themselves as a part and parcel of a nation.