Explanation:
To determine the correct option from the given lists, we need to understand the significance of each state and its base of creation.

Nagaland - Culture:
Nagaland, located in the northeastern part of India, is known for its rich cultural heritage. It is home to various indigenous tribes, each having its distinct customs, traditions, and languages. The cultural diversity of Nagaland is reflected in its festivals, music, dance, art, and handicrafts. Therefore, option (a) Nagaland - Culture is correct.

Assam - Language:
Assam, another state in northeastern India, is known for its linguistic diversity. The official language of Assam is Assamese, which is widely spoken by the majority of the population. Additionally, various other languages such as Bodo, Bengali, and Hindi are also spoken in different regions of Assam. Therefore, option (b) Assam - Language is correct.

Jharkhand - Linguistic:
Jharkhand, a state in eastern India, was created based on linguistic and cultural differences. It was originally a part of Bihar, but due to the demands of the tribal communities and their distinct languages, Jharkhand was formed as a separate state. The major languages spoken in Jharkhand include Hindi, Santali, Mundari, and Kurukh. Therefore, option (c) Jharkhand - Linguistic is correct.

Uttarakhand - Geography:
Uttarakhand, located in the northern part of India, is known for its diverse geography and natural beauty. It is situated in the Himalayan region and is home to several mountain ranges, rivers, lakes, forests, and wildlife. The state is known for its pilgrimage sites, hill stations, and adventure tourism. However, the creation of Uttarakhand was not solely based on its geography, but rather on the demands for a separate state by the people of the region. Therefore, option (d) Uttarakhand - Geography is incorrect.

In conclusion, the correct options are:
(a) Nagaland - Culture
(b) Assam - Language
(c) Jharkhand - Linguistic