Read this excerpt from a story.

Antwon and his sister stepped gingerly down their porch stairs, reaching the driveway with some difficulty. "I can’t believe they didn’t cancel school," Lucy complained.

"It's just a little ice. It'll be gone by noon," Antwon countered, but as he replied, his boots slipped and he went down, landing with a grunt on the curb.

"I'm alright," he muttered, gathering his belongings. He rose slowly and continued walking. His pace was noticeably slower, and he eyed the pavement suspiciously.

What type of conflict does Antwon experience?

person vs. self
person vs. person
person vs. society
person vs. nature