Answer :
The most significant difficulty with estimating reliability with the alternate or parallel forms procedure is developing two sound instruments that are equivalent or parallel. hence, Option C is correct.
What do you mean by reliability?
The possibility that a product, system, or service will function as intended for a predetermined amount of time or will run faultlessly in a predetermined environment is known as reliability.
The stability or consistency of test results is measured by reliability. It can also be viewed as the capability of a test or a set of research findings to be replicated. A trustworthy instrument that consistently measures the right temperature is a medical thermometer, for instance.
hence, The most significant difficulty with estimating reliability with the alternate or parallel forms procedure is developing two sound instruments that are equivalent or parallel. Option C is correct.
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"Your question is incomplete, probably the complete question/missing part is:"
a. calculating the correlation coefficient using two different forms.
b. the effects of remembering specific items in the second testing.
c. developing two sound instruments that are equivalent or parallel.
d. finding two similar sets of test takers.