Pipe slope is computed asrise (or fall) divided by run, expressed as a percent:
This matches standard civil engineering definitions of grade/slope as elevation change over horizontal distance.
Here, the elevation drop from the service end to the ma5.202 =0.465 m.
Horizontal distance (run) =22.10 m.
Slope = 0.465 / 22.10 = 0.02104 =2.104%, which rounds to2.1%.
This calculation reflects standard practice used in roadway and pipeline work for checking grades, confirming that installed utilities meet design slopes for gravity flow. The answer choice that matches the computed slope is2.1% (Option C).

Comprehensive and Detailed 150 to 200 words of Explanation From Civil Engineerurces:
The depicted assembly is a typical framed deck platform: verticalpostssupport larger horizontal members ( beams/girders) which in turn support closely spacedjoists, with thedeckinglayer on top forming the walking surface. Structural terminology distinguishes ajoistas a secondary member supporting floors/roofs, while decking(planking/metal deck/boards) forms the surface supported by joists. EM 385-1-1 defines steel joists as secondary load-carrying members used to support floors and roofs, and it uses "metal decking" as the surface system placed on framing members/joists-confirming the joist-decking relationship in structural assemblies.
The image's labels correspond to: A =post(vertical support), B =joist(repetitive smaller members), C =beam (primary horizontal support under joists), and D =decking(top surface). That mapping matches optionC.

Concrete slabs shrink as they cure and experience temperature/moisture changes. Because the slab is restrained by subbase friction and adjacent elements, tensile stresses develop and cracking is likely unless the slab is intentionally "weakened" at planned locations.Control joints(also called contraction joints) are formed or saw-cut to create a deliberate plane of weakness so that shrinkage cracking occurswhere intended, producing straighter, serviceable cracks that are easier to seal and maintain. Technical references describe contraction/control joints as placed at regular intervals specifically tocontrol random crackingby encouraging the crack to form along the joint line, relieving tensile stresses in the slab. Expansion joints address thermal expansion, isolation joints separate the slab from fixed elements, and construction joints occur where placements stop and start; none of those are primarily intended tocontrol crack locationthe way control joints are. Therefore, the joint type that determines where cracks occur is thecontrol joint.