Step 1: Recall the load path in different joints.
In lap joints and single cover butt joints, the line of action of the load is offset from the centroid, causing eccentric loading.
Step 2: Identify the non-eccentric joint.
A double cover butt joint is symmetrical about the plate, so the load passes through the centroid without eccentricity.
Hence,
\[
\boxed{\text{Double cover butt joint}}
\]
is the correct answer.
Therefore,
\[
\boxed{(C)}
\]
is the correct answer.