Answer B
Explanation:
I agree a little more with B because it states a knife found in river which could mean they look for some or who knife belonged to so that could be a red herring.
<span>While the student wrote the essay, the instructor graded papers.
</span>
<span><span>Investigation Type Purpose Includes a Hypothesis?
</span><span>Descriptive To draw conclusions No, but does answer a question
</span><span>Comparative To determine relationships Yes
</span><span>Experimental To determine a causal relationship <span>Yes
</span></span></span>
