Suppose the graph of the parent function y=cot(x) is vertically compressed to produce the graph of the function y=a cot(x) but there are no reflections. which describes the value of a?
a. a< -1
b. -1 c. 0 d. a> 1

We are given:

parent function y = cot (x) which is vertically compressed to produce y = a cot(x) with no reflections. 

The graph of the cotangent function is opposite of tangent function. You can observe that if the function will be vertically compressed it will shift towards zero but not less than zero, so the value of a is best described as d a>1.