Safiya wants to teach her brother how to test the acidity of the soil in their garden. What should she explain after telling him the steps of testing the soil?

A. what materials he will need
B. what the main goal of the test is
C. how to tell whether the test was accurate
D. how to gather a good soil sample during the test

C.how to tell whether the test was accurate

Explanation:

This is because, after the test, Safiya's brother should be able to check if the test carried out was accurate and not wrong as directed.

This could be done through series of validation technique rather than assuming that the test carried out was correct.

modal adverbs are used to modify specific verbs that consist of a linking verb (verb of being) and sometimes another verb. examples of modal verbs include can, could, may, might, must, shall, should, will and would.

modal auxiliary. an auxiliary verb characteristically used with other verbs to express mood, aspect, or tense. in english, the most common modal auxiliaries are can, could, may, might, must, ought, shall, should, will, and would. also called modal .

the choice that is not a technique that you should use to come up with ideas for the topic of a research project is, writing about academic subjects that are not interesting to you. this does not belong to the techniques to come up with ideas because having no interest in a certain topic will lose your drive to come up with better ideas. it gives no room for improvement and acquiring of new ideas and information. 

explanation: