Based on a Recent Poll, There Is a 50-50 Chance $1 / 2$

Multiple Choice

Based on a recent poll, there is a 50-50 chance that a randomly selected adult has pierced ears. Express the indicated degree of likelihood as a probability value between 0 and 1.

A) $1 / 2$ or $0.5$
B) $1 / 50$ or $0.02$
C) $1 / 4$ or $0.25$
D) $3 / 4$ or $0.75$