In the passage, Jem's boastful behavior, such as claiming to have gone up to the Radley house and challenging Scout's perception of him running, suggests that he is attempting to present himself as more fearless and confident than he may genuinely feel. This portrayal aligns with the inference that he is trying to project a tougher image. The correct answer is A. He is trying to act tougher than he really is.
In this passage from "To Kill a Mockingbird," Jem's boastful demeanor, boasting about approaching the Radley house and challenging Scout, implies an attempt to present himself as braver than he may truly feel. The inference is that he is striving to act tougher, possibly to dispel any lingering fears about Boo Radley.
His demeanor suggests a desire to showcase courage and maturity, especially in front of Walter and Scout. This facade of toughness may be driven by a mix of peer influence, the desire to impress others, and the need to overcome the spooky reputation of Boo Radley in their neighborhood.
Option A is correct.