Final answer:
The domain of the function y = 4sin(x) is b) (-∞, ∞).
Step-by-step explanation:
The domain of a function represents the set of all possible input values.
In this case, the function is y = 4sin(x).
Since the sine function is defined for all real numbers, there are no restrictions on the input, which means the domain is (-∞, ∞).