Final answer:
The total voltage of a torch with two cells labeled '1.2V' each, when connected in series, is 2.4V, which is answer B.
Step-by-step explanation:
If a torch has two cells, each labeled '1.2V,' the total voltage depends on how the cells are connected. Cells arranged in series add their voltages, whereas cells in parallel maintain the same voltage. Assuming the cells are connected in series, which is typical for most torch designs, you simply add the voltage of each cell together.
The calculation is as follows:
1.2V + 1.2V = 2.4V
Therefore, the correct answer is B. 2.4V.