Correct Answer - Option 4 : Manoj
According to the given statement;
1) A group of five students has different heights. Raj is shorter than Simran.
Simran > Raj
2) Simran is shorter than Manoj.
Manoj > Simran > Raj
3) Manu is only taller than Kriti.
Manoj > Simran > Raj > Manu > Kirti
Hence, Manoj is the tallest in the group.
Manu is taller than only Kriti or Manu is only taller than Kriti means Manu cannot be taller than any other person, except Kriti, so ultimately it means Manu is second smallest. If many is taken as tallest than he will be taller that 4 people which violates the statement.