I'm not sure if this is right but I think it's A
A logarithmic function without a subscript means that it must be log base 10.
When learning about logarithms, a textbook/teacher provides their students with the following general equations
Hopefully you are familiar with this. Using the equations that I just showed, we can change the equation to
This would make answer choice C correct.
To determine first if A Square is a Rhombus.
Let us define a rhombus.
1) Has all four sides equal.
2) Has opposite sides parallel.
3) The diagonals bisect the angles and bisect each other at 90 degrees.
A Square also displays all of these properties.
So a Square is ALWAYS a Rhombus.
But a Rhombus is a not always a Square, except that Rhombus is a Square.