D. Inequality
An expression would just contain simple arithmetic without any symbols relating two things to another.
An equation must contain an equals sign.
A fraction will have a bar representing division.
An inequality contains a sign representing a comparison of magnitude, in this question less than <.
Hope this helps!!
It is 3 cause i got it wrong and that was the right anser
I cant see it please send another pic of it. closer to the screen.
Working attached below:
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