Juanita Martinez works in a college-based child care program. Each day, part of Juanita's job is to jot down things that have happened with each child (e.g. snippets of conversation, poems the child made up, a story the child told). To facilitate this, Juanita carries around 3 × 5 index cards. Which method of record keeping is Martinez utilizing?

A. event sampling

B. journaling

C. anecdotal records

D. running record observation