For a div defined as <div class="col-sm-2 col-lg-4">, how many columns wide will it be in a sm viewport?

In Bootstrap's grid system, the total number of columns available in a row is 12. The classes assigned to the div specify how wide the column will be on different viewport sizes.

For small viewports, the class "col-sm-2" indicates that the div will take up 2 out of the 12 columns available. This means that in a small viewport, the div will occupy approximately 16.67% of the row's width (since 2 divided by 12 equals 1/6 or approximately 16.67%).

Therefore, the correct answer indicates that the div is indeed 2 columns wide in a small viewport, aligning perfectly with Bootstrap's grid design framework. This understanding is crucial for responsive design, allowing developers to create fluid layouts that adjust well to various screen sizes.