Correct Answer: Option C

Explanation

I - Lag phase   II - log phase or exponential phase (Growth)  III - Stationary phase   IV - Death phase

The range at which soil essential elements concentration is recorded for optimal plant growth is during the log phase, which is a phase of rapid growth in plants:

• Log phase: This is the phase of rapid growth in plants.
• Lag phase: This is the initial phase of growth when the rate of growth is very slow.
• Stationary phase: This is the phase when the rate of growth starts decreasing and finally stops

Stationary / steady phase is where finally growth stops.

The range at which soil essential elements concentration is recorded for optimal plant growth is marked II. 

There is an explanation video available below.

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