Step 1: Analyze the Sentence
The sentence implies that the correct word order and tense should be used for clarity and correctness.
The adverb "carefully" describes the verb, so it should come after the verb in the sentence.
Step 2: Evaluate the Options
- (a) Carefully planning: Incorrect because the sentence is not in the continuous form. ❌
- (b) Careful to plan: Incorrect because "careful" is an adjective and does not fit properly with the verb "plan". ❌
- (c) Plan carefully: Correct choice as it places the adverb "carefully" correctly after the verb "plan" and fits the context of the sentence. ✅
- (d) Planned carefully: Incorrect because this is in the past tense, whereas the sentence requires the present tense. ❌
Step 3: Final Answer
The correct answer is (c) Plan Carefully.