correct answer is: c) 70 liters

Explanation

Here we can use ‘Unitary Method’.
17 days a family consumes = 42.5 liters of milk
\therefore 1 days they consume =\large\frac{42.5}{17} liters of milk
\therefore 28 days they consume =\large\frac{425\times28}{17\times10} liters of milk
\rightarrow 70 liters of milk
Ans: 70 liters of milk will they consume in 28 days.

An alternative way to phrase this particular query is possible:
1. How much milk will a family consume in 28 days if they consume 42.5 liters in 17 days?
2. What is the total milk consumption expected for a family over 28 days, if they currently consume 42.5 liters in 17 days?
3. Find the quantity of milk a family will use in 28 days given their consumption of 42.5 liters over 17 days.
4. Determine the milk consumption for a family over 28 days, based on their current rate of consuming 42.5 liters in 17 days.
5. Calculate the anticipated milk usage for a family over the course of 28 days, considering their consumption of 42.5 liters within 17 days.