Roland must ride his bike through a monsoon to get home.
An external conflict is between a character and another character, nature, or society. In the correct answer, Roland is going against nature: a monsoon. An external conflict is different than an internal conflict. An internal conflict is one the character has with him/herself. It is usually a decision the character has to make. In the options Roland getting overconfident and choosing to practice everyday are internal conflicts. The last option has nothing to do with conflict.
As you know, an external conflict usually represents the idea of outside-forces influence, and <span> sentence which accurately describes an external conflic is the first one :Roland must ride his bike through a monsoon to get home. You can see how external force opposes on the journey of the main hero.</span>
