The correct answer is option 'D', which means that the legs of insects are joined to both the thorax and the abdomen. Let's explore why this is the case.

Explanation:

Insects have three main body segments - the head, the thorax, and the abdomen. Each segment serves a specific purpose and has distinct characteristics.

1. Head:
The head is located at the front of the insect's body and houses important sensory organs such as the eyes, antennae, and mouthparts. It is responsible for sensing the environment, receiving information, and feeding.

2. Thorax:
The thorax is the middle segment of the insect's body. It is the attachment site for the insect's legs and wings. The thorax contains three pairs of jointed legs, which are crucial for locomotion and various other activities such as walking, jumping, and grasping. Each leg is composed of several segments, including the coxa, trochanter, femur, tibia, and tarsus. These segments provide flexibility and allow the insect to perform a wide range of movements.

3. Abdomen:
The abdomen is the posterior segment of the insect's body. It houses vital organs such as the digestive, reproductive, and respiratory systems. The abdomen is typically longer and more flexible than the other segments, allowing for the expansion and contraction of internal organs. It also plays a role in maintaining the insect's balance and stability.

Connection between the legs, thorax, and abdomen:
The legs of insects are connected to both the thorax and the abdomen. This connection is crucial for the insect's overall body structure and locomotion. The joint between the legs and the thorax provides stability and support, enabling the insect to move its legs freely. On the other hand, the connection between the legs and the abdomen allows for coordinated movement and flexibility.

In summary, the legs of insects are joined to both the thorax and the abdomen. This connection enables the insect to perform various locomotor activities and maintain its balance and stability.

An Insect has six legs which are attached to the thorax and abdominal part of its body.