Answer:
1 - D
3 - E
5 - F sharp
Explanation:
The root is D, so you count up from D and go up by halves (semi-tones) so you'll go from 1(D), 2(Dsharp), 3(E), 4(F), 5(Fsharp).
I hope this helps you.
Root: D
Third: F#
Fifth: A
