Biotic resources are those resources that are obtained from the biosphere, which refers to the part of the Earth where living organisms exist. These resources are derived from living or once-living organisms, including plants, animals, and microorganisms. Biotic resources are essential for the survival and well-being of human beings as they provide us with food, medicine, fuel, and other materials necessary for our daily lives.

Here are some key points to understand why the correct answer is option 'B':

1. Definition of Biotic Resources:
- Biotic resources are derived from the biosphere, which encompasses all living organisms and their interactions with the environment.
- These resources include both renewable and non-renewable resources obtained from living organisms.

2. Examples of Biotic Resources:
- Food: Crops, fruits, vegetables, fish, meat, and other edible products are obtained from plants and animals.
- Medicines: Many medicines and drugs are derived from plants, animals, and microorganisms.
- Timber: Wood, used for construction and furniture, is obtained from trees.
- Fibers: Cotton, jute, and silk are obtained from plants and animals and used for making textiles.
- Fuel: Biomass, such as wood and agricultural waste, can be used as a source of energy.
- Animal products: Products like wool, leather, and honey are obtained from animals.

3. Importance of Biotic Resources:
- Biotic resources are vital for sustaining life on Earth and supporting various human activities.
- They provide us with essential nutrients, energy, and raw materials for manufacturing.
- Biotic resources also contribute to the economy through agriculture, forestry, and pharmaceutical industries.
- Preservation and sustainable management of biotic resources are crucial to maintain ecological balance and ensure the availability of these resources for future generations.

In conclusion, biotic resources are those obtained from the biosphere, which includes living organisms. These resources are fundamental for human survival and provide us with food, medicine, fuel, and various other materials necessary for our daily needs.