What is the topic sentence of this paragraph

The social contact theory states that

Question 2 of 102 pointshow did the protestant reformation impact the european enlightenment? oa. it convinced many europeans that only biblical laws should befollowed. ob. it required christians to sign a social contract with the protestantchurchoc. it created a new christian country with a republican form ofgovernmentd. it led many people to question the idea that a king's power camefrom god.

Dr. redbull conducts a study to determine whether her new energy drink children perform better on spelling tests. she randomly assigns children to one of two groups: group 1 receives her energy drink and group 2 receives water. she then gives both groups a spelling test and compares the results. which of the following is true about this study? a. group 1 is the dependent variable and group 2 is the independent variable. b. this is a correlational study. c. group 2 is the experimental group. d. the independent variable is the type of drink the children receive.