Answer:
OIL o RIG sr
2Sr will be oxidation because it'll loses (2) electrons to O2. So, oxidised to form 2SrO
O2 will be reduction because it'll gain (2) electrons from Sr
Sr is oxidised. Thus, reducing agent because it causes O2 to be reduced.
O2 is reduced. Thus, the oxidising agent because it causes Sr to be oxidised.
Reducing agent = Sr
Oxidising agent = O2
Hope this helps!