Answer:
I could be wrong but wouldn't it be all of the sentences suggested?
Explanation:
<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>
The author wants the reader th feel entruged
