Final answer:
In 'Nether Grave,' Jeremy hinders his chances with the girl he likes by a) pretending to be someone else, which is a common narrative pitfall in literature.
Step-by-step explanation:
In Nether Grave, Jeremy creates an obstacle to dating the girl he likes by: a) Pretending to be someone else.
This choice aligns with the often literary theme where a character is not true to themselves in an attempt to impress or win over another, which typically creates complications or leads to the unraveling of the situation.