The flower grew tall to compete for sunlight, what did its neighbor do?\nOptions:\n- blossom\n- park\n- open\n- cast shadow\n- vase
Step-by-step reasoning:
cast shadow
When a neighbour plant casts shadow due to its length, another flower need to grow tall to get sunlight.

Casting shadow of a neighbur plant may result in another plant competing for sunlight.

.

So, the answer is cast shadow