A、Since the 1860s. B、Since the 1920s. C、Since the 1930s. D、Since the 1960s. AWhen did colored photography become possible?

The last radical change in cinema was the development of color. Colored photography was possible from the 1860s, but early films were normally black and white and any coloring was painted on by hand—an expensive, slow and not very effective technique.
    In 1922 the first real color films were produced, using a two-color system called Technicolor. It was quite common at that time to film whole sequences in one color and the attempts to mix colors to get realistic effects were not very successful, in 1932 Technicolor was improved by the use of three main colors and, in general, the same system is used today.
    Color took longer to be accepted than sound. It was expensive and people often felt, oddly, that it was less realistic than black and white. This was partly, of course, because the quality was not always very high and so the scenes could look very peculiar. Since the 1930s there have been many improvements in the techniques of cinema, and the style of acting has changed a good deal. But after fifty years the basics—moving pictures, color and sound are still the same.