Construction process — arrange these steps in a meaningful order from groundwork to finishing: a) Foundation, b) Plastering, c) Building (structural construction), d) Painting.

Introduction / Context:
Buildings are erected in stages: first the base, then the structure, then finishing works. This question abstracts that progression into four broad steps you must order correctly. The goal is to preserve dependencies: you cannot finish a surface that does not yet exist, and you cannot construct a structure without a foundation.

Given Data / Assumptions:

• Tokens: Foundation (a), Building/structure (c), Plastering (b), Painting (d).
• We ignore many intermediate trades (framing, services) and focus on these four milestones.

Concept / Approach:
First, lay the Foundation to transfer loads safely. Next, raise the Building/structural shell. After the structure is in place, internal/external surface finishing begins: Plastering precedes Painting so that paint can adhere to a prepared, even surface. Thus the order is Foundation → Building → Plastering → Painting.

Step-by-Step Solution:
1) Foundation (a) — base.2) Building (c) — structural work.3) Plastering (b) — surface preparation/finish.4) Painting (d) — final finishing coat.Therefore: a, c, b, d.

Verification / Alternative check:
Painting before plastering would be meaningless; plastering before the structure exists is impossible; foundation cannot be later than building.

Why Other Options Are Wrong:

• a, b, c, d: Puts plastering before the structure.
• c, a, b, d / c, a, d, b: Start with the structure before foundation.

Common Pitfalls:
Equating “building” with “finishing”; the structure precedes finishes like plaster and paint.

Final Answer:
a, c, b, d