1.which statement best expresses the cartoons message?
a. women are not paid the same as men
b. on average most women only earn about 80 cents per day
c. the glass ceiling will be broken for a woman who has earned enough money
d. it is unfair that women are underrepresented in the area of corporate management

In the picture, we see a woman working hard - presumably she is the last to leave the office, and a complaint that she does not earn a lot (only 80 cents)

Let's go through the options;

A.women are not paid the same as men 
-this is a good answer, as we know that it's true so her complaint about money might refer to that

B.on average most women only earn about 80 cents per day - this would be true if we just looked at the cartoon, but we know that at least in the US, that is not a likely salary

C.the glass ceiling will be broken for a woman who has earned enough money  - there is nothing in the picture that suggests the part of "has earned enough money" so we can reject this option

D.it is unfair that women are underrepresented in the area of corporate management - I find this equally appropriate - presumably she is a secretary but has to work harder than her boss. However, the caption points to the salary so I would actually say that option a) is the best one.