Which statement correctly describes napoleon bonaparte?
a. he established the continental system to keep american goods out of europe.

b. he joined a coup that overthrew the directory in 1799 and was named first consul.

c. he refused robespierre's offer to crown him emperor of the french.

Correct  

Reasons why the other answers are incorrect:

Further detail about Napoleon's rise to power in the 1799 coup:

Napoleon came to power through a military coup in 1799, which is known as the Coup of 18 Brumaire.  (The French Revolution had redone the calendar and renamed months; 18 Brumaire would equate to November 9 on standard calendars.)

Here's the backstory on how Napoleon came to be in a position to be part of that coup and then, ultimately, seize power by himself:

The French Revolution had involved much chaos and turmoil in France. By  the time Napoleon stepped into the picture, there was a desire for law and order and stability. He brought that as a military leader who was not afraid to fire "a whiff of grapeshot" (as one historian termed it) on royalist opponents in order to control and defeat them. ("Grapeshot" was Napoleon's use of cannons like shotguns to fire shrapnel at those opposing his troops.) By the time of that event, Napoleon had already established his military reputation against the British in the Battle of Toulon.

The Directory was a 5-man committee that led France in the later stages of the Revolution.  But the Directory was ineffective and weak, and Napoleon was showing himself to be strong and effective in battles for France.  Napoleon conspired to plan a military coup, with the cooperation of two Directory members, Emmanuel-Joseph Sieyes and Pierre Roger Ducos. Before long after that, Napoleon positioned himself to be solely in charge of French government.

30 and 44 are b

explanation: