How does this interaction affect the plot

Paul Atreides, a brilliant and gifted young man born into a great destiny beyond his understanding, must travel to the most dangerous planet in the universe to ensure the future of his family and his people. As malevolent forces explode into conflict over the planet's exclusive supply of the most precious resource in existence, only those who can conquer their own fear will survive. His interaction with Harkonnens, led by Baron Harkonnen, want to overthrow the emperor by taking over the melange supply on Arrakis. This affects the plot by creating major conflict and a rivalry.  

yes the first one is correct .

a is is the correct answer