Question

A student uses an indicator to measure the pH of a solution. The indicator shows a pH of 7. What must be true of this solution?

Answer 1

A pH of 7 is known as "natural"

 A pH below 7 is an acid

A pH above 7 is a base

Acids give up hydrogen ions, shown as H+ 
Bases accept  H+, hydrogen ions.

Equilibrium is when a chemical reaction doesn't favor the reactants or products and can go in reverse. 
pH of 7 are related to Equilibrium.

With the info I have given you, it's obviously not one of the last 2 you listed.

pH measures the alkalinity and acidity of a solution by the Hydrogen ions, H+. Therefore, the solution has to have Hydrogen ions to react/be measured by the pH paper.

Therefore, your answer is the 2nd statement. 
The solution has equal amounts of hydronium ions and hydroxide ions. 

Answer 2

Answer:

The solution has equal amounts of hydronium ions and hydroxide ions.

Explanation:

From the very beginning it is clear that answer choices 3 and 4 are incorrect, as a pH of 7 means it is neutral.

The pH of anything being 7 (neutral) means it is neither an acid (1-6) nor a base (8-14).

This essentially levels things out meaning that there will be an equal amount.