Josh works for MooMoo Milkshakes. The company wants to know what milkshake flavor is the most popular. Today, he surveyed every third female customer on their favorite milkshake flavor. Eighteen customers (out of 57 total) were surveyed, and 7 customers prefer MooChooChocolate, 4 customers prefer VeryStrawberry, and 7 customers prefer BananaBoBanna.

Is there a sampling bias in the situation above?
A.
Yes. Josh only asked female customers.
B.
There is not enough information.
C.
No. The company is only interested in males' opinions.
D.
No. Josh asked random customers, so there is no bias.