Lilianna uses the equation, d\left(\dfrac{3}{4}+1\right)=12\dfr ac{1}{4}d( 4 3 ​ +1)=12 4 1 ​ d, left parenthesis, start fraction, 3, divided by, 4, end fraction, plus, 1, right parenthesis, equals, 12, start fraction, 1, divided by, 4, end fraction to represent the situation. What does the variable ddd represent in the equation? Choose 1 Choose 1 (Choice A) A Calories per minute Lilianna uses walking (Choice B) B Number of calories Lilianna would have used sitting (Choice C) C Number of minutes Lilianna walked