Here's a problem to solve: A student's mother is heterozygous for attached earlobes, a recessive trait. The student's father is also heterozygous for that trait. What is the percent likelihood that this student has attached earlobes?

Among the 4 following options, which is the correct answer?

- A: 0%
 
- B: 25%
 
- C: 50%
 
- D: 75%
 