C

Step 1: The number of items in each rectangle is the height times the width.

Step 2: The items= (4 × 3) + (4 × 2) [So, instead of doing 2 separate multiplications, use distributive property.]

Step 3: = 4 × (3 + 2)[Take out the common factor.]

Step 4: = 4 × 5[Perform addition.]

Step 5: = 20[Multiply]