The sentence that best explains how the widespread application of steam power affected En glish agriculture in the first half of the nineteenth century is option B. Agricultural produce could be marketed far from the areas where it was grown.
At early 19th century the British invented steam locomotives, which allowed the transportation of large amounts of goods and raw material to be delivered from the farms to the cities. Now fresh goods could be transported to far places.
B. The National Assembly. This group dismantled the monarchy and in fall through spring of 1793-4, set about what would be called "The Reign of Terror", the bloodiest and most violent period of the French Revolution. The was led by Maximilien Robespierre and his associated Committee of Public Safety.