Can Pleasant Aromas Help People Work More Efficiently? Researchers Did

Multiple Choice

Can pleasant aromas help people work more efficiently? Researchers did this study to find out. Twenty-two students worked a paper-and-pencil maze six times. On three tries, they wore a mask with floral scents. On the other three tries, they wore a mask with no scent. The six tries were done in random order and each used a different maze. The researchers found that the subjects took less time to complete the maze when wearing the scented mask.
This study is a(n)

A) experiment.
B) observational study.
C) sample survey.
D) census.
E) population.