Explanation:

To explain the answer, let's first understand the different communication options mentioned in the question.

Landline phone:
A landline phone is a traditional telephone that is connected to a physical line through the telephone network. It allows people to make and receive calls within a limited range.

Internet:
The internet is a global network of interconnected computers and devices that allows users to communicate, share information, and access various services. It provides a wide range of communication options, including email, instant messaging, video calls, and social media platforms.

Cellular phone:
A cellular phone, also known as a mobile phone or cell phone, is a portable device that uses wireless communication technology to make and receive calls, send messages, and access the internet. It operates through cellular networks and provides mobility and convenience.

Fax:
A fax machine is a device that transmits printed documents electronically over a telephone line. It converts the document into a digital image and sends it to another fax machine where it is printed out.

Now, let's analyze the given options:

Option A: Landline phone
Although a landline phone allows voice communication, it may not be the most suitable option for chatting with a friend. It lacks features like text messaging and multimedia sharing, which are commonly used in modern communication.

Option B: Internet
The internet is a versatile and widely-used communication medium that offers various options for chatting with friends. It provides platforms like email, instant messaging, and social media, which allow text-based conversations, voice calls, and even video calls. However, the question specifies that Shalini wants to chat, so the internet is a possible option but not the correct one mentioned in the answer.

Option C: Cellular phone
A cellular phone is a popular choice for personal communication. It provides features like text messaging, voice calls, and internet access, making it suitable for chatting with friends. Cellular phones are portable and convenient, allowing people to stay connected even when they are on the move.

Option D: Fax
Fax is not a suitable option for chatting with a friend. It is primarily used for transmitting documents, not for real-time conversation or personal communication. Fax machines are not designed for chatting purposes and lack the necessary features for it.

Therefore, based on the given options, the correct answer is option C: Cellular phone. It is the most suitable choice for Shalini to chat with her friend Seema, as it provides the necessary features and convenience for personal communication.