To determine which items cost less than $3.75 per item, we first need to calculate the price per item for each of the items listed.
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Paperbacks: $10.65 for 3 \[ \text{Price per paperback} = \frac{10.65}{3} = 3.55 \]
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Notebooks: $14.36 for 4 \[ \text{Price per notebook} = \frac{14.36}{4} = 3.59 \]
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Puzzles: $11.85 for 3 \[ \text{Price per puzzle} = \frac{11.85}{3} = 3.95 \]
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Picture Frames: $15.20 for 4 \[ \text{Price per picture frame} = \frac{15.20}{4} = 3.80 \]
Now let's summarize the price per item:
- Paperbacks: $3.55
- Notebooks: $3.59
- Puzzles: $3.95
- Picture Frames: $3.80
Next, we compare these prices to $3.75 per item:
- Paperbacks ($3.55) - less than $3.75
- Notebooks ($3.59) - less than $3.75
- Puzzles ($3.95) - not less than $3.75
- Picture Frames ($3.80) - not less than $3.75
The items that cost less than $3.75 per item are paperbacks and notebooks.
Thus, the correct answer is: paperbacks and notebooks.