To write an equation in standard form for the weights of kumquats \( k \) (in pounds) and Asian pears \( p \) (in pounds) that a customer can buy for $16, we need to relate the weights to their prices.
The price per pound for kumquats is $4.50, so for \( k \) pounds, the cost is \( 4.5k \).
The price per pound for Asian pears is $3.75, so for \( p \) pounds, the cost is \( 3.75p \).
The total cost must equal $16, leading us to the equation:
\[ 4.5k + 3.75p = 16 \]
This is already in standard form. Therefore, the correct answer is:
4.5k + 3.75p = 16