Petals Plus.
Each arrangement costs $35.85, plus $67.00 for delivery.
This can be expressed as

Where a represents the arrangements.
Blooms.
Each arrangement costs $25.09, plus $118.00 for delivery.

Where a represents the arrangements.
Now, we have to form an expression to relate both expressions.

This expression will give us the number of arrangements needed to get a better offer from Blooms.-

Notice that we have to get less than 4.74 arrangements to get a better deal with Blooms.
Therefore, the right answer is D. 4.