Yes the correct answer is D.
As per PMBOK® Guide 5th Edition
Estimating activity durations uses information on activity scope of work, required resource types, estimated resource quantities, and resource calendars. The inputs of the estimates of activity duration originate the project team, most familiar with the nature of the work in the specific activity. The duration estimate is progressively elaborated, and the process considers the quality and availability of the input data. The Estimate Activity Durations process requires an estimation of the amount of work effort required to complete the activity and the amount of available resources estimated to complete the activity.
The project scope statement is the description of the project scope, major deliverables, assumptions, and constraints. The project scope statement describes, in detail, the project’s deliverables and the work required to create those deliverables. It also provides a common understanding of the project scope among project stakeholders. It may contain explicit scope exclusions that can assist in managing stakeholder expectations.
Activities, distinct from milestones, have durations, during which the work of that activity is performed, and may have resources and costs associated with that work. Activity attributes extend the description of the activity by identifying the multiple components associated with each activity. The components for each activity evolve over time. During the initial stages of the project, they include the activity identifier (ID), WBS ID, and activity label or name, and when completed, may include activity codes, activity description, predecessor, activities, successor activities & logical relationships. Activity attributes are used for schedule development and for selecting, ordering, and sorting the planned schedule activities in various ways within reports.
Refer to Page 123, 166 of PMBOK® Guide 5th Edition