Read the given question and decide which of the following options is additionally required to answer the question.
The ages of three persons A, B, and C are in the ratio 5 ∶ 4 ∶ 3. A is the eldest person, while C is the youngest person. What is the age of C?
1
The difference between the ages of A and B is equal to the difference between the ages of B and C.
2
The total age of all the three persons is less than 100 years.
3
A is 16 years older than C.
4
B's age is equal to the average age of all the three persons.