Red, that's why it appears red.
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Red objects reflect red light and absorb other colors of light. This means that when white light shines on a red object, the red wavelengths are reflected back to our eyes, making the object appear red.
Red objects appear black in blue light because red and blue are complementary colors. When blue light shines on a red object, the object absorbs the blue light and reflects very little light, making it appear black to our eyes.
A yellow object will appear black in red light because red light does not contain any yellow wavelengths to reflect off the object. Yellow objects reflect yellow wavelengths, so in the absence of these wavelengths, the object will not reflect any light, appearing black.
Red boots will appear the same shade of red in red light because they reflect or absorb light based on their color. In red light, red objects will reflect and appear red, maintaining their original color.
A green shirt appears white in magenta light because magenta light contains red and blue wavelengths of light but no green. The absence of green light causes the green shirt to appear white, as white is a combination of all colors of light.
Leaves absorb mostly red and blue light but reflect or transmit green light, which is why they appear green to our eyes. Therefore, green light is the color least absorbed by leaves.