C is the answer to this question.
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I believe the answer is Observational study
In an observational study, the data input couldn't be controlled by researchers because it's relative to the subject.
This type of study usually being conducted in researchers that involve ethical measurement or Personal opinion.
That statement is false
Sole proprietors is a type of business which ownership is fully controlled by one single individuals. By definition, two people cannot become co -owners of a sole proprietorship.
The other options that those people could pursue is partnership. In partnerships, two or more individuals can be part-owners of their business establishment. The percentage of ownership could be determined based on how much capital they injected to the business.
<span>The cause could be attentional saturation - where you use or see an item often and know what it looks like.With the cobination of seeing/using it often blurs what it actually looks like or what the details of the item are.</span>