Select the correct choice below and, if necessary, fill in the answer boxes to complete your choice.

A$.$ The effect for detailing is $$ with a range from $$ to $.$ Rather than a $1\%$ gain in market share for each $1\%$ increase in detailing voice, the model estimates a smaller return on this promotion. $($Round to two decimal places as needed.$)$

B$.$ The effect for detailing is $$ with a range from $$ to $.$ Rather than a $1\%$ gain in market share for each $1\%$ increase in detailing voice, the model estimates a larger return on this promotion. $($Round to two decimal places as needed.$)$

$$ C$.$ A multiple regression model cannot be developed based on these data. No interpretation is possible.