According to article ii, what is the president's main duty?
a. to carry out laws that have been passed
b. to give first readings to introduced bills
c. to make court rulings on standing laws
d. to interpret laws that have been passed

Apart from the Article II: B, C, and D are not duties of the president.

B: no, this would be a waste of time, and anyway, this is the role of the parliament, i.e. the legislative Branch, and the president is the executive branch

C: no, this belongs to the judicial branch of the government

d: this depends on what the interpretation is for, but it's not a role of the president anyway.

The correct answer is A: the president is the head of the executive Branch of the Government, which carries the laws th were passed.

Now, I am not too sure which part of the Article II is relevant, but the beginning is probably already relevant for A: "The executive power shall be vested in a President of the United States of America."