In the following question, a sentence is given in the active voice. Out of the four alternatives, select the option that correctly expresses the same sentence in the passive voice for the sentence: Karnataka grows coffee.

Introduction / Context:
This question tests your understanding of how to change a sentence from the active voice to the passive voice while keeping the tense and meaning the same. The original sentence is a simple present tense sentence that talks about a general fact: Karnataka grows coffee. Such general truths are very common in competitive English exams.

Given Data / Assumptions:

• Active sentence: Karnataka grows coffee.
• Subject: Karnataka.
• Verb: grows.
• Object: coffee.
• We must convert it into passive voice without changing the time reference or overall meaning.

Concept / Approach:
In active voice, the structure is usually Subject + Verb + Object. In passive voice, the object of the active sentence becomes the subject of the passive sentence. The basic pattern is: New subject + appropriate form of be + past participle of the main verb + by + original subject (optional if the doer is obvious or not important). For a simple present tense sentence with a plural subject, we generally use is or are plus the past participle.

Step-by-Step Solution:
Step 1: Identify the object that will become the new subject. Here, coffee is the object.Step 2: Move coffee to the beginning of the passive sentence as the new subject.Step 3: Determine the correct form of be for simple present tense and a singular uncountable noun. Coffee takes is.Step 4: Use the past participle of the verb grow, which is grown.Step 5: Keep the place phrase in Karnataka to show where this happens.Step 6: Form the full passive sentence: Coffee is grown in Karnataka.

Verification / Alternative check:
If we convert the passive sentence Coffee is grown in Karnataka back to active voice, we get Karnataka grows coffee. This matches the original sentence in meaning and tense, which confirms that the passive construction is correct. The sentence expresses a habitual or general fact, and simple present tense passive with is grown is the natural structure for such statements.

Why Other Options Are Wrong:
Option A: Coffee was grown in Karnataka. This uses past simple tense and suggests that coffee used to be grown in Karnataka at some time in the past, which changes the time reference.
Option B: Coffee has been grown in Karnataka. This uses present perfect tense and implies a focus on completion rather than a general ongoing fact.
Option D: Let coffee be grown in Karnataka. This is an imperative suggestion or request, not a passive statement of fact, so it does not express the same idea as the original sentence.

Common Pitfalls:
Students often change the tense while forming passive voice, especially when they focus only on the form of the verb and forget the time reference. Another common mistake is to create a grammatically correct sentence that no longer represents a general fact. Some learners also think that passive voice always requires the phrase by plus the subject, but in many factual statements the agent is obvious or unimportant and is omitted. Here, including by Karnataka would be possible but is not necessary. Remember to keep both the meaning and the tense unchanged when shifting between active and passive voice.

Final Answer:
The correct passive voice form of the sentence Karnataka grows coffee is Coffee is grown in Karnataka.