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It’s C. You add the things together and divide by 4

C.) 70
Find the mean of the data with each of the choices and see which one is equal to 50

Ineed the rest of the question and answers

the law of definite proportions states samples of a compound will always contain the same proportion of elements by mass. in other words, a given compound will always contain the same elements in the same proportions by mass.the law of multiple proportions states when two elements combine with each other to form more than one compound, then the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.