Answer:
Yuri Gagarin was the person to go on space.
Answer: a. testing effect
Explanation:
Testing effect is a type of threat to internal validity of an experiment. Internal validity is assessing whether a factor makes a difference in an experiment or not and if it does, whether there is adequate evidence to support this correlation.
Testing as a threat to internal validity is when a second test is taken on the outcome of a first test. Other internal validity threats are history, maturation, instrument modifications.
The answer I'd go with is workers. All of the options are involved in the Capitalistic economy, but all resources are privately own which is why workers makes the most sense to me. Hope this helped and sorry for any errors.
