Answer:
A. In spring and summer to coincide with the growing season.
Step-by-step explanation:
Temperate grassland have hot summers, cold winters and little seasonal rainfall. This biome receives water in form of spring rains. The hot summer temperature leads to melting of snow during early summers. Hence, water availability support the growth of grasses during spring and early summers. Food (grasses) availability makes the native animals to breed during these seasons. Late summer season of temperature grassland is marked by higher temperatures which in turn makes the grasses dry. The snow covered ground of winter season and resulting food scarcity do not favor reproduction.