This researcher used a "cross-sectional survey design"
<u>Explanation:</u>
A cross-sectional survey gathers data at one point in time to make conclusions about a population of interest (i.e. universe). Cross-sectional surveys have also been represented as snapshots of the demographics they gather data. Panel surveys are typically performed to assess changes in the studied population.
In this a process of sampling where scores are collected at a single point in time. For instance, cross-sectional sampling might include collecting data from individuals of different ages or levels of development to examine behavioral or other variations between them.
I believe The answer is B. Hope this Helps :)
When the moon is in the middle of earth and the sun.
I think the answer is B. Hope this helps.
They are all connected by cell phones which can also use the internet. Cell phones