The mechanisms of DNA synthesis differs between the two new daughter strands during replication. This is due to the fact that:

• A. one RNA primer attaches to the 5' end of the parent strand and the other primer to the 3' end.
• B. Both daughter strands can't extend toward the replication fork because there would not be room for two DNA polymerase enzymes.
• C. Both RNA primers attach to the 3' end of the template strands, which are at opposite ends from each other.
• D. The DNA strands run antiparallel to each other and the DNA polymerase can only add nucleotides to the 3' end of the growing strand.

Answer: (D)

Verified step by step guidance

1. Understand that DNA strands are antiparallel, meaning one strand runs 5' to 3' and the other runs 3' to 5'.
2. Recognize that DNA polymerase, the enzyme responsible for adding nucleotides, can only add to the 3' end of a growing DNA strand.
3. Identify that during DNA replication, one strand (the leading strand) is synthesized continuously in the direction of the replication fork.
4. Note that the other strand (the lagging strand) is synthesized discontinuously in short segments called Okazaki fragments, which are later joined together.
5. Conclude that the difference in synthesis mechanisms is due to the antiparallel nature of DNA and the directionality of DNA polymerase activity.