Answer: The researchers used several methods for testing their data, the article explains them all.
Explanation:
I'm no english teacher but I believe the use of the comma after data should've been a period and the T in <em>the</em> should've been capitalized.
Santa, sleigh, ant, hi, eat, that's all I can think of right now
I believe the answer is C. because in the passage it states that the Egyptians observed the beetles useful work.
Hope this helps!