The project manager is truly the heart and soul of a project. Project managers are expected to successfully bring their projects to fruition (achieved pre-determined quality) while keeping a tight rein on budgets (costs) and schedules (time). In order to fulfill the requirement of time, cost and quality, a project manager needs to acquire a set of skills to help him to manage the project and solve variety of problems during the implementation of project. These skills can be divided into two categories, which are hard skills and soft skills.
The heart and soul of a project is the project manager. He has to realize the goals keeping in mind costs and schedules. Acquiring soft skills and hard skills are integral to his development.
Option (d) captures all the aspects of the paragraph. All other options are incomplete.