Given below is a pedigree chart of a family with five children. It shows the inheritance of attached earlobes as opposed to the free ones. The squares represent the male individuals and circles the female individuals [AIIMS 2004] Which one of the following conclusions drawn is correct

• A. The parents are homozygous recessive
• B. The trait is Y-linked
• C. The parents are homozygous dominant
• D. The parents are heterozygous