**Explanation:**

Flexible links are used to transmit motion between two rotating shafts. They are called flexible links because they can bend and flex to accommodate misalignment and allow the transmission of motion even when the shafts are not perfectly aligned.

The options given are connecting rod, belt, chain, and ropes. Let's analyze each option to determine if it is a flexible link or not:

**a) Connecting Rod:**
A connecting rod is a rigid link that connects the piston to the crankshaft in an engine. It does not have the ability to flex or bend, making it a rigid link rather than a flexible link. Therefore, option A is NOT a flexible link.

**b) Belt:**
Belts are commonly used as flexible links in various mechanical systems. They are made of flexible materials such as rubber or synthetic fibers and can easily bend and flex to transmit motion between two rotating shafts. Belts are commonly used in applications such as power transmission, conveying systems, and timing mechanisms.

**c) Chain:**
Chains are also flexible links commonly used in mechanical systems. They are made up of individual links connected together, which allows them to bend and flex. Chains are often used in applications where higher strength and durability are required, such as in heavy machinery, bicycles, and conveyors.

**d) Ropes:**
Ropes are another example of flexible links. They are made of twisted or braided fibers or strands, which gives them flexibility and the ability to bend and flex. Ropes are commonly used in applications such as lifting, rigging, and securing loads.

In conclusion, the option that is NOT a flexible link is **a) Connecting Rod**. The connecting rod is a rigid link and cannot bend or flex to accommodate misalignment between the rotating shafts.

A correct.. because kinetics is related to inertia forces