A question is given below followed by two statements numbered (I) and (II) each containing some information. Decide which of the statements is/are sufficient to answer the question.
Q: Who is tallest among Monika, Sharad, Nitin and Ratna?
(I) Ratna is taller than Monika but shorter than Nitin.
(II) Sharad is shorter than Monika.

Monika, Sharad, Nitin and Ratna

Question: Who is tallest?

Statement (I):
Ratna is taller than Monika but shorter than Nitin.
So, Nitin > Ratna > Monika.
No information about Sharad.
Hence, statement (I) alone is not sufficient.

Statement (II):
Sharad is shorter than Monika.
So, Monika > Sharad.
No information about Ratna and Nitin.
Hence, statement (II) alone is not sufficient.

Using both statements together:
From (I): Nitin > Ratna > Monika
From (II): Monika > Sharad

Combined order:
Nitin > Ratna > Monika > Sharad

So, Nitin is the tallest.

Thus, both statements together are necessary to answer the question.

Thus, correct option is (c).