The two uses of figurative language that create a vivid understanding of the character Emil are:
b. Emil has been perfecting his robotics project for 50 million years d. Emil's work with robotics makes him the Einstein of Lincoln High School
The second option employs hyperbole to emphasize the dedication and time Emil has invested in his robotics project, while the fourth option uses a simile to compare Emil's intellect and talent in robotics to that of Einstein, highlighting his exceptional abilities.