The correct answer is: D. None of the above
A lap joint is a type of joint where two pieces of metal are overlapped and then joined together with rivets. The rivets are placed in a staggered pattern so that they do not line up with each other. This helps to distribute the load evenly and prevents the joint from splitting.
A butt joint is a type of joint where two pieces of metal are joined together at their ends. The joint is then reinforced with a cover plate, which is a piece of metal that is welded or riveted to the joint.
A butt joint with single cover plate is a type of butt joint where a single cover plate is used to reinforce the joint. The cover plate is welded or riveted to the joint on both sides.
A butt joint with double cover plates is a type of butt joint where two cover plates are used to reinforce the joint. The cover plates are welded or riveted to the joint on both sides.
All of these types of joints are subject to bending stresses. The bending stresses are caused by the load that is applied to the joint. The load causes the joint to bend, and this bending causes the rivets to be stressed. The rivets must be strong enough to withstand the bending stresses in order to keep the joint from failing.
In conclusion, none of the types of riveted joints listed in the question are free from bending stresses.