**Core Concept**
DNA replication is a complex process involving multiple enzymes and factors. The replication of DNA is divided into two main stages: the initiation phase and the elongation phase. During the elongation phase, Okazaki fragments are synthesized on the lagging strand.

**Why the Correct Answer is Right**
The enzyme responsible for polymerizing Okazaki fragments is DNA polymerase delta. This enzyme is specifically involved in the replication of the lagging strand and is capable of synthesizing short DNA fragments. DNA polymerase delta has a proofreading function that allows it to correct errors as it synthesizes the new DNA strand. The enzyme also interacts with other proteins, such as proliferating cell nuclear antigen (PCNA), to facilitate its activity.

**Why Each Wrong Option is Incorrect**
* **Option A:** DNA polymerase alpha is involved in the initiation phase of DNA replication and is responsible for synthesizing the RNA primer that is necessary for the elongation phase, but it does not polymerize Okazaki fragments itself.
* **Option B:** DNA ligase is an enzyme that seals the gaps between Okazaki fragments by forming a phosphodiester bond between the 3'-end of one fragment and the 5'-end of the next fragment, but it does not polymerize them.
* **Option C:** Topoisomerase is an enzyme that relaxes supercoils in the DNA molecule by cutting and rejoining the DNA strands, but it is not involved in the synthesis of Okazaki fragments.

**Clinical Pearl / High-Yield Fact**
The process of DNA replication is highly regulated to ensure that the genetic material is accurately copied and passed on to daughter cells. Any errors in DNA replication can lead to mutations and potentially result in cancer or other diseases.

**Correct Answer: C. DNA polymerase delta**