Initial bill without discount = $250
A particular price was agreed on in the contract between the insurance company and the medical laboratory and the insurance company?
Question: What is the percent discount specified by the contract between the laboratory and the insurance company?
Statement 1: The insurance group is required to pay only 20 percent of the original bill for the test?
If the insurance company paid 20% of the original bill.
Therefore, total discount % = 100% - 20% = 80% of original bill. So, statement 1 is SUFFICIENT.

Statement 2: The insurance company is required to pay $46 for the test.
If 100% of the bill = $230
The x% of the bill = $46
$$x\%=\frac{100\cdot46}{230}=20$$
Therefore, the insurance company is required to pay only 20%.
=> Discount = 100 - 20 = 80% of original bill.
Therefore statement 2 is SUFFICIENT.

Since each statement alone is SUFFICIENT, then the correct answer is option D.