Final answer:
c. The Multiply blend mode creates semitransparent shadow effects and multiplies the value of the base color by the blend color.
Step-by-step explanation:
The mode that creates semitransparent shadow effects and multiplies the value of the base color by the blend color is c. Multiply blend.
When the Multiply blend mode is used, the colors of the base and blend layers interact in such a way that the result becomes a combination of both colors with increased saturation. This mode is commonly used in graphic design and image editing software to create realistic shadows and to darken colors.