For an experiment comparing two treatment conditions, there will be score(s) for each participant if a within-subjects design is used and there will be score(s) for each participant if a between-subjects design is used

1, 3

Explanation:

For an experiment comparing two treatment conditions, there will be one (1) score for each participant if a within-subjects design is used and there will be three (3) score(s) for each participant if a between-subjects design is used. If a between-subjects designed is used, one score is gathered for each of the subject. This score is then averaged with the scores of the other subjects in the other group (treatment group), and then these average scores of each group are compared to check for the effectiveness of one treatment over the other.

d. the polar jet stream   lies between the polar easterlies and trade winds should be your answer