This control on the Layers Palette in Photoshop changes the selected layer, allowing to show through from underneath.

a See-through
b transparency
c saturation
d color mode

i am little confused between a and b...

To determine which answer is correct, let's break down the question and analyze the options provided.

The question is asking about a control on the Layers Palette in Photoshop that changes the selected layer to allow something to show through from underneath. This implies that the control is related to adjusting the opacity or transparency of the layer.

Now, let's look at the options:

a) See-through: While "see-through" implies transparency, it is not a technical term commonly used in Photoshop. It can be considered a colloquial term for transparency, but it is not the official term used in the software.

b) Transparency: Transparency refers to the quality or state of being transparent, allowing objects or layers to be seen through. In the context of Photoshop, this usually refers to the Opacity control, which determines how opaque or transparent a layer is.

Looking at the options given, "transparency" seems to be the most accurate answer. The control being described allows you to adjust the transparency of the selected layer to reveal what is underneath it.

Therefore, the correct answer is b) transparency.