Silicon sodium
nitrogen
potassium

Use the periodic table to predict which element is nonmetallic AND a gas at room temperature.
A) nitrogen
B) potassium
C.)silicon
D) sodium

I would contend that the right answer is actually the B) A character who plays a trick.

Explanation: Just to elaborate a little on the answer, it can be added that monster dragons and men in sea-green dresses patterned with shells do not appear often in everyday life, so option A should be discarded. In addition, the excerpt does not contain a lesson about human behaviour and it does explain the origin of a tradition. The right answer is, therefore, the B. Hidesato had first seen a monster dragon, but it soon disappeared and was replaced by a "strange-looking" man. This suggests that the character was performing a trick, and tricks—animals acting like humans, for instance—are a feature of this type of tale.