Which of the following statement is true?

In Microsoft PowerPoint, you can indeed insert text boxes using the drawing toolbar.

Inserting Text Boxes:
You can insert text boxes from the drawing toolbar or from the Insert tab. The drawing toolbar or the Insert tab includes an option to add text boxes, which allows you to create and place text boxes anywhere on your slides.

Text Boxes and Layouts:
Text boxes can be inserted at any time, not just when choosing a slide layout. They are versatile elements that can be added, moved, and resized as needed throughout the presentation.

Other Options:
The other options are incorrect because you can insert text boxes from the drawing toolbar, and text boxes are not restricted to the slide layout selection.

Therefore, the correct answer is Option A: You can insert text boxes from drawing toolbar in PowerPoint.