What’s the drawback of optimizing only for online conversions?

Question: What’s the drawback of optimizing only for online conversions?

• You may miss out on potential customers who purchase offline only or research online but buy in-store.
• You may miss out on potential customers who show interest in your product.
• You may miss out on potential customers who watched your ad
• You may miss out on potential customers who engage across all ad formats

The right answer was: You may miss out on potential customers who purchase offline only or research online but buy in-store.