What is the difference between a histogram and a bar chart?

What is the difference between a histogram and a bar chart?  A)The adjacent rectangles in a histogram have a gap, while those for a bar chart do not.  B) The adjacent rectangles in a bar chart have a gap, while those for a histogram do not. C) A histogram reflect qualitative date, while the bar chart represents quantitative data.  D) A histogram and a bar chart both reflect qualitative data.      I believe all four are incorrect, personally.  Am I right?