Concept:The figure shows two members overlapping and fitted together with a groove/recess, which identifies a grooved-lap joint.Explanation:The parts in Figure 1 are not joined end-to-end as a butt joint, nor are they only simply overlapped as a plain lap joint.They are joined by lapping one part over the other while a groove is used to hold them firmly.This matches the description of a grooved-lap joint.Answer:B. grooved-lap joint.
