Explanation : The right word to precede the proposition 'on' is imposed. Tax is not collected on ....... people. Tax is not placed on people, Tax is not charged on people. Hence, choices (a), (b) and (c) are not the answers. Tax is imposed....... on........
Explanation : (a) 'Discovery'refers to something that existed previously and came to knowledge later. Home is not a discovery. (b) Home is not a certain. It is a set up which comes into being as a result of a certain composition of various factors. (c) Home is not a new invention of anyone at any stage of development. So choice (d) is the best answer. Home is an institution just like 'marriage. Home is a reality only when its members accept certain principles.
Explanation : The key words are 'plunging' and 'investor confidence'. If markets are plunging, investor confidence is low. This aspect is brought out best by choice (c).