Introduction:
In order to determine which tumbler weighs more, we need to consider the information provided in the question. The options given are:
a) A
b) B
c) Both weigh the same
d) Cannot be predicted

Explanation:
To determine the weight of the tumblers, we need more information about the tumblers themselves. The question does not provide any specific details about the tumblers or their characteristics, such as material, shape, or size. Therefore, it is not possible to determine which tumbler weighs more based on the given information.

Option A:
The question does not provide any information about tumbler A, so we cannot determine its weight.

Option B:
Similarly, the question does not provide any information about tumbler B, so we cannot determine its weight.

Option C:
The question states that both tumblers weigh the same. However, this statement contradicts the given options, which imply that there is a difference in weight between the two tumblers. Therefore, option C cannot be the correct answer.

Option D:
The correct answer to this question is option D, which states that the weight of the tumblers cannot be predicted. Since the question does not provide any information about the tumblers, we cannot make any assumptions or predictions about their weight.

Conclusion:
In summary, the question does not provide enough information to determine which tumbler weighs more. The correct answer is option D, as the weight of the tumblers cannot be predicted based on the given information.