Dr. Bryson is a health psychologist who researches nutrition. She is curious as to whether a new drink additive will help people consume fewer calories during a meal. The drink additive is a white, odorless, tasteless powder that a person can add to any drink. She collects a random sample of 63 overweight students on campus and measures the calories they eat during lunch using a bomb calorimeter. She then gives this additive to the same 63 participants to use at dinner and measures how many calories they eat (again using the bomb calorimeter). Which of the following threats to internal validity will Dr. Bloedorn NOT be worried about? a. Placebo effects
b. Attrition
c. Testing effect
d. Demand characteristics

Option A

Explanation:

In simple words, The placebo effect occurs when ailments resolve notwithstanding the use of a pseudo medication. Psychological variables such as expectancy or traditional training are thought to have a role. The placebo effect has been shown in studies to help with pain, weariness, and depression.

Thus, from the above we can conclude that the correct option is A.

answer; i believe the correct answer is norming;

the best and most correct answer among the choices provided by the question is the second choice "less supportive to the war of 1812"

the war of 1812 was a military conflict that lasted from june 1812 to february 1815, fought between the united states of america and the united kingdom, its north american colonies, and its native american allies.

i hope my answer has come to your . god bless and have a nice day ahead!