The correct sentence is ”Lata is not as tall as Sudha.” This is the grammatically correct way to express a comparison of height between two people.
Step 2: Evaluating the Other Options
"Lata is not tall as Sudha" (Option B) is incorrect because it omits the necessary word "as" to correctly compare the two subjects.
"Lata is not too tall as Sudha" (Option C) is incorrect because "too tall" implies excessive height, which changes the intended comparison.
"Lata is not so tall than Sudha" (Option D) is incorrect because "than" is used in comparative structures when comparing differences, but "as...as" should be used for equality.
Step 3: Conclusion
Thus, the correct sentence is: ”Lata is not as tall as Sudha.”