Which short narrative would be the most appropriate style and tone for the personal essay section of a college application?

i started volunteering at the hospital a few years ago. it's been fun.
it feels like i've been chipping in at the hospital for forever and a day. it's been wicked cool.
i have proffered my time and resources to the invalids for nigh on three years. it has been most diverting.
ever since my grandfather had a heart attack three summers ago, i have volunteered my afternoons and weekends at the local hospital.