Ulga's research is just about complete. Now, comes the worrying. She is concerned that the multiple studies she conducted over the course of six months might produce inconsistent and less-than-stable results. What is Ulga concerned about?

the reliability of her research.

Explanation:

In the conduction or a research or experiment, for such a research or experiment to be termed "reliable" it means that the experiment or research is CONSISTENT and STABLE that is to say consistency and stability us the key to a reliable research.

If you look at the question again, Ulga is afraid that her research couuld "produce inconsistent and less-than-stable results". Check the points there: '' inconsistent" and "less-than-stable results". So, Ulga concerned about the RELIABILITY of her research.

Please do note that reliability and validity are not the same. Validity deals with accuracy while reliability deals with consistency.

a.indigo and cochineal

b.animal hides

c.silver and gold

e.cacao beans and sugarcane

answer; implicit memories explicit;