Which instrument was popularized during the classical period because of its responsive action and better gradual dynamics?

I believe the correct answer is piano.

 

In the art epoch of Classicism (19th century), the instrument which was popularized because of its responsive action and better gradual dynamics was piano. Because of its gradual dynamics, piano replaced harpsichord and became the favorite instrument of classical sonata.

Its the 3rd one i think

Photography has changed its subject matter quite a lot over the past few years. in the 1800's, it was considered normal for families to have  post mortem photos of their loved ones, and now that would be completely unacceptable. i think that photographers have always pushed boundaries and have been eager to capture everything, it is just society that changes their boundaries.