c. Soil → f. Plant → b. Cotton → a. Thread → d. Cloth → e. Rag

Correct Option: B

Meaningful order:
c. Soil → f. Plant → b. Cotton → a. Thread → d. Cloth → e. Rag

d. Foundation → b. Walls → a. Windows → e. Roof → c. Floor → f. Room

Correct Option: B

Meaningful order
d. Foundation → b. Walls → a. Windows → e. Roof → c. Floor → f. Room

Logical arrangement of words is Encoding → Sending → Receiving → Decoding

Correct Option: D

Logical arrangement of words is Encoding → Sending → Receiving → Decoding
i.e., (ii), (i), (iii), (iv)

2. Tamarind leaf → 1. Mango leaf → 3. Papaya leaf → 4. Banana leaf

Correct Option: C

Arrangement of leaves according to their size (from small to large)
2. Tamarind leaf → 1. Mango leaf → 3. Papaya leaf → 4. Banana leaf

4. Lithosphere → 1. Hydrosphere → 3. Biosphere → 2. Atmosphere

Correct Option: A

Meaningful order of the words in ascending order:
4. Lithosphere → 1. Hydrosphere → 3. Biosphere → 2. Atmosphere