Multi-choice problem: Continue writing the next sentence in this paragraph:

How to prepare soil for the application of fertiliser
Send a sample of soil to a local cooperative extension.
Collect a sample of your soil by digging a couple of holes that are 5-6 inches (13-15 cm) deep. Then, store the soil in an airtight plastic container or sealable bag and send it to the cooperative extension for tests.

OPTIONS: (a). They will evaluate the soil and give you recommendations for amendments and fertilizers. Cooperative extension offices test and study agriculture and the environment and can be found at certain universities.; (b). The cooperative extension will evaluate the nitrogen and phosphate levels in your soil. It will ask you to identify levels of phosphorus and potassium values, ammonium and potassium.; (c). You will not be able to test the soil until you report that you have entered the soil beyond the very first threshold. See submit your test results within 1 week or 2 weeks of the sample being sent.; (d). You can also have your sample digitized to reflect the gfci's criteria. Test your soil type using soil testing kits.;
(a).