Chemicals can be classified as acidic, neutral, or basic, depending on their
\(\mathrm{pH}\) measurements. \(\mathrm{A} \mathrm{pH}\) below 7 indicates that a
substance is acidic, a \(\mathrm{pH}\) of 7 means that a substance is neutral,
and a pH above 7 means that a substance is basic. An indicator is a chemical
compound that, when added to a substance, changes color based on the
\(\mathrm{pH}\) of the solution. For example, cabbage juice is an indicator that
turns blue when added to a basic substance.
$$
\begin{array}{|l|l|}
\hline \text { Liquid } & \text { pH } \\
\hline \text { apple juice } & 3 \\
\hline \text { water } & 7 \\
\hline \text { acid rain } & 5 \\
\hline \text { ammonia } & 11 \\
\hline
\end{array}
$$
Based on the information and the table above, which of the following
substances, if combined with cabbage juice, would cause the cabbage juice to
turn blue?
A. apple juice and acid rain
B. water
C. acid rain
D. ammonia