Clients weight is taken before and after participating in the latest fitness craze for a month. What is the simplest test to see if there is an effect of the fitness craze?

Please pick one of the below answers. The correct answer is one of the following options:

Two-way factorial ANOVA

One-sample t-test

Chi-square test of independence

Randomized incomplete block design

Chi-square goodness-of-fit

Factor screening

Chi-square with blocking

Monte-carlo simulation

Log the variable

Square the variable

One-way ANOVA

Randomized Complete Block Design

Jackknife-boostrapping

One-way ANOVA with blocking

Latin square design

Paired t-test

z-test

independent t-test with blocking

independent t-test

adjust for p-value inflation