Question

click to correct the pronoun if needed. because the stallion often becomes skittish during thunderstorms, its handler warned sandra and i to keep a safe distance.

Explanation:

The pronoun "I" in the object position in "warned Sandra and I" is incorrect. The correct pronoun should be "me" as it is the object of the verb "warned".

Answer:

Because the stallion often becomes skittish during thunderstorms, its handler warned Sandra and me to keep a safe distance.