Abhishek classified living organisms into four groups (I, II, III and IV) each containing four members on the basis of the habitats in which they are found. In doing so, he unknowingly placed one wrong member in each group. Identify the odd one out and select the correct option regarding this.
I. Gorilla, Macaw, Cactus, Orchid
II. Kangaroo rat, Rattle snake, Date palm, Tape grass
III. Reindeer, Polar bear, Arctic fox, Gila monster
IV. Pistia, Vallisneria, Fir, Hydrilla

Options

A. In group I, cactus is placed incorrectly and should be replaced with date palm of group II.
B. In group II, tape grass is incorrectly mentioned and should be replaced with Pistia of group IV.
C. In group III, Gila monster is mentioned incorrectly and should be replaced with snowshoe hare.
D. Fir is wrongly placed in group IV and should be replaced with macaw of group I

Explanation

To solve the problem, we need to identify the odd one out in each of the four groups based on their habitats. Let's analyze each group step by step.

### Step 1: Analyze Group I
**Members:** Gorilla, Macaw, Cactus, Orchid
**Habitats:**
- Gorilla: Rainforest
- Macaw: Rainforest
- Cactus: Desert
- Orchid: Rainforest

**Odd One Out:** Cactus
**Reason:** Cactus belongs to the desert habitat, while the others belong to the rainforest.

### Step 2: Analyze Group II
**Members:** Kangaroo rat, Rattle snake, Date palm, Tape grass
**Habitats:**
- Kangaroo rat: Desert
- Rattle snake: Desert
- Date palm: Desert
- Tape grass: Aquatic

**Odd One Out:** Tape grass
**Reason:** Tape grass belongs to the aquatic habitat, while the others belong to the desert.

### Step 3: Analyze Group III
**Members:** Reindeer, Polar bear, Arctic fox, Gila monster
**Habitats:**
- Reindeer: Polar
- Polar bear: Polar
- Arctic fox: Polar
- Gila monster: Desert

**Odd One Out:** Gila monster
**Reason:** Gila monster belongs to the desert habitat, while the others belong to the polar habitat.

### Step 4: Analyze Group IV
**Members:** Pistia, Vallisneria, Fir, Hydrilla
**Habitats:**
- Pistia: Aquatic
- Vallisneria: Aquatic
- Fir: Mountain
- Hydrilla: Aquatic

**Odd One Out:** Fir
**Reason:** Fir belongs to the mountain habitat, while the others belong to the aquatic habitat.

### Summary of Odd Ones Out:
- Group I: Cactus
- Group II: Tape grass
- Group III: Gila monster
- Group IV: Fir

### Conclusion:
The odd ones out in each group are:
- Group I: Cactus
- Group II: Tape grass
- Group III: Gila monster
- Group IV: Fir

The correct option regarding the odd one out is **Group III: Gila monster**, as it is the only member that does not belong to the polar habitat.