In an innovative research project focusing on biomedical applications, a team of chemists and materials scientists is developing a new biocompatible polymer, 'Polymer B', for use in targeted drug delivery systems. The synthesis of 'Polymer B' involves a novel polymerization technique and a series of steps to ensure its functionality and biocompatibility. The sequence of the polymer development is as follows: 'Polymer B' is synthesized through a controlled radical polymerization process, using a monomer derived from a naturally occurring bioactive compound. The polymer chain is then functionalized with specific ligand molecules that have a high affinity for certain cancer cell receptors. Subsequently, 'Polymer B' undergoes a grafting process to attach hydrophilic side chains, enhancing its solubility and circulation time in the bloodstream. Finally, the polymer's ability to encapsulate and release a chemotherapeutic drug in a controlled manner is evaluated under physiological conditions. Based on this sequence, what is the primary challenge or objective in the development of 'Polymer B' for targeted drug delivery in cancer therapy? Options: A. Maximizing the mechanical strength and durability of the polymer B. Enhancing the polymers biocompatibility and target specificity C. Developing a cost-effective and scalable synthesis process D. Achieving high thermal stability and resistance to degradation Hints: Consider the importance of each step in the development process and how it contributes to the performance of the polymer in a biomedical context. Reflect on the key properties required for polymers used in targeted drug delivery systems, especially in cancer therapy. Think about the balance between biocompatibility, functionality, and effectiveness in the context of medical applications.