Answer:
The weight of a bag of potatoes.
Step-by-step explanation:
Continuous variable are those which can take infinite number of value between any two values.
For example: amount of sand : it can take any value let say between 100 and 101 kg. Such 100.1 kg, 100.888 kg and so on.
Discreet variable are those which takes values which can take on natural number values such 1,2 , and so on.
Example : no of students of class: no. of students can only be natural numbers like 45, 35 and so on
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lets evaluate options now
a. The number of cars in a parking lot.--> it is Discreet variable as no. of cars can be in terms of natural numbers
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The weight of a bag of potatoes. it is continuous variable as weight can take infinite set of values like 200 kg, 200.11 kg, 200. 111119 kg and etc.
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The number of repairs at a computer shop over the course of the week.
--> it is Discreet variable as number of repairs will also vary in natural number form like 10 repairs, 20 repairs etc. there cannot be 10. repairs.
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d. The total runs scored in a cricket game
---> It is Discreet variable as number of runs scored is also natural number like 251 runs, 301 runs. Runs cannot be 300.2 runs.
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Hence, correct answers is
The weight of a bag of potatoes.
batches. We will need 
cups of butter. This is 
cups. Since we can only buy butter in boxes with 2 cups of butter in it, we will have to buy 3. This will give us 6 cups of butter, which will be enough. If we only buy 2, then we will only have 4 cups of butter, which won't be enough to bake 15 batches of cookies.