Answer: A. T2
Explanation:
When we first toss a coin then roll a die, then the sample space of the event must contain element that has :
First component of coin : T or H
Second component of dice : 1 , 2 , 3, 4, 5, 6,
The element of the sample space for first tossing a coin then rolling a die will look like: T1, T2, H1, H2, ...... so on.
From all the given options the element of the sample space for first tossing a coin then rolling a die = T2