Paul is describing a mineral to douglas over the phone. he explains that it has the same texture throughout but the color on the inside is different from the color on the outside. douglas tells paul that -
a) he is correct. paul has a mineral.
b) he is incorrect. a mineral has many textures.
c) he is correct. a mineral has one texture but more than one color.
d) he is incorrect. a mineral has just one color, inside and outside.