In a party, 75 persons took tea, 60 persons took coffee and 15 persons took both tea and coffee. We can represent this information via a Venn diagram for better visualization.

You may notice that the circles representing Tea and Milk are not overlapping. That’s because no one taking milk takes tea.

We can further deduce the following information from the Venn diagram given above.

So, the total number of persons that attended the party = $75 + 45 + y = 120 + y$

Now, let’s consider the given statements. Statement 1: 50 persons took milk.

So, $x + y = 50$. But using this we cannot find out the total number of persons that attended the party, as we cannot find the value of $y$. So, Statement 1 alone is not sufficient.

Statement 2: Number of persons who attended the party is five times the number of persons who took milk only. So, $120 + y = 5y$ Or $4y = 120$ Or $y = 30$

So, the total number of persons that attended the party = $120 + y = 120 + 30 = 150$ So, Statement 2 alone is sufficient.

Hence, option (A) is correct.