A well-designed portfolio assessment in social sciences should be: (a)…

Portfolio assessment is a technique of continuous and comprehensive evaluation: a purposeful and systematic collection of a student's work, compiled over time, that captures effort, progress, and achievement in the process of learning. Its aim is to document how learning develops, not to generate an administrative record such as a report card.

Testing each listed characteristic against this definition: being purposeful and systematic is a genuine requirement, since a portfolio must be deliberate about what is collected and why; reflecting the student's regular assignments and ongoing activities is genuine too, because these form the evidence of learning; and accumulating that work over an extended period is genuine, as growth becomes visible only across time. The remaining characteristic — treating the preparation of a report card as the main focus — does not fit, because report-card preparation is a summative, administrative task, whereas portfolio assessment centres on the learning process itself.

• The combination of purposeful/systematic design, reflection of the student's regular work, and report-card focus carries the administrative report-card claim, so it is not fully accurate.

• The combination of reflection of the student's regular work, report-card focus, and long-term accumulation likewise carries the report-card claim, so it is not fully accurate.

• The combination of purposeful/systematic design, report-card focus, and long-term accumulation again carries the report-card claim, so it is not fully accurate.

• The combination of purposeful/systematic design, reflection of the student's regular work, and long-term accumulation carries no such claim and lists only genuine features of portfolio assessment.

Hence the correct characteristics are purposeful and systematic; reflecting the student's regular assignments and activities; and accumulation of work over a long period — the combination read as (a), (b) and (d).