In the following figure, the square represents painters, the triangle represents men, the circle represents accountants and the rectangle represents Americans. Which set of letters represents Americans who are NOT men?

To find the set of letters that represents Americans who are NOT men, we need to identify the letters that lie inside the geometric shape representing Americans (the rectangle) but look at the options available for representation.
The letters enclosed within the rectangle are H, I, G, and F. Among the given options, option D (HIGF) uniquely and completely specifies this designated regional group of letters belonging to the rectangle.