Which of the following is a low reactive metal with respect to reaction with water?

In the reactivity series, the elements that are present above H in the reactivity series are referred to as highly reactive elements as they can easily react with water.

Metals like Na, K, and Ca are present above H in the reactivity series and can easily react with water to form respective hydroxides and release H₂ gas.

For example: $\mathrm{Ca}+2{\mathrm{H}}_2\mathrm{O}\to \mathrm{Ca}{\left(\mathrm{OH}\right)}_2+{\mathrm{H}}_2$

But platinum (Pt) is present below H in the reactivity series and hence will not react with water like Na, K, and Ca. Hence, platinum is also known as a noble metal.

Hence, Pt is a low-reactive element with respect to its reaction with water.