To find the portion of ice cream each friend receives when five friends share a gallon of ice cream equally, we can represent this with the equation:
\[ \text{Portion per friend} = \frac{1 \text{ gallon}}{5 \text{ friends}} \]
This can be written as:
\[ \text{Portion per friend} = \frac{1}{5} \]
If your options A, B, C, and D include this equation, the correct option would be the one that represents this division. Since I don't have the actual equations listed, you should look for an equation that resembles:
\(\frac{1}{5}\) or \(1 \div 5\).
If any of your options represents that, that would be the correct answer.