How long did it take for the stovepipe dunes to form?

The correct answer is - it takes thousand of years to form.

Explanation:

A dune is a mountain of the sand form by the water flow or winds over a long time. It occurs mostly in deserted regions or. Stovepipe is a type of dune formed by the wind. It generally longer on the wind side. Shorter side known as slip face are on the lee of the wind.

The stovepipe dunes are formed by the wind for a long time. The dunes normally take several centuries to thousands of years to form.

Thus, the correct answer is - it takes thousand of years to form.

you didn't give any options but heres what i can tell you: an inference is likely to change based on additional observations. the latter is something that you have seen or sensed using your sensory organs while the former is like a conclusion out from what you have observed.