The balance used to measure the mass of the rock reads it in three different lines. The first one is related to the first digits, meeaning that the first one will be 3. As it is in a hundred scale, we add the second line, which shows the number 50. At the end, the third line will be added too, showing us the number 4,6. To fully measure, we add the three values, as follows: 300 + 50 + 4,6 = 354,6. Therefore, the correct answer is d) 354,6g.