Answer:
Objective text.
Step-by-step explanation:
Carlos wants to write about insects and how they are used to build small robots. 
This isn't a narrative, because Carlos is not writing a story. He is writing about facts. 
This is objective because Carlos isn't planning to use any opinions in his text. He's just writing a neutral writing.
This isn't subjective because subjective means using opinions. Carlos is writing neutrally, 
Opinionated uses opinions. Carlos is writing neutrally.