Basically Samantha makes six bracelets per hour, so: After 1 hour she makes 6 After 2 hours she makes 12 After 3 hours she makes 18 After 4 hours she makes 24, therefor the answer is B
This can also be modelled by the equation B = 6t, where B is the number of bracelets and t is the number of hours, so: B = 6(4) = 24