Lyndon Johnson is the president your looking for
The answer is obviously B. Th Spanish conquistadors were outnumbered 8 to 1. Their best weapons were the diseases they brought with them. In Europe decades before, Europeans lived in closely tight villages making disease rampant and frequent. This mad them have strong immune systems while the native Americans always lived far apart because north and South America are big, making less disease meaning that they could build up a strong immune system.
Renaissance thinkers encouraged individuals to question how things work, and scientists began to test these ideas with experiments during the Scientific Revolution.