Rearrange the parts of the sentence in correct order.
A single uranium
P. pencil eraser, contains the same energy
Q. pellet, slightly larger than a
R. as a ton of coal, 3 barrels of oil
S. or 17,000 cubic feet of natural gas

Correct option is C

The sentence talks about the amount of energy that can be generated from a single uranium pellet, which is slightly larger than a pencil eraser. The sentence then goes on to compare this energy to that produced by a ton of coal, 3 barrels of oil, or 17,000 cubic feet of natural gas.
If we arrange the parts of the sentence in the correct order, we get:
Q. pellet, slightly larger than a
P. pencil eraser, contains the same energy
R. as a ton of coal, 3 barrels of oil
S. or 17,000 cubic feet of natural gas
Hence, option (c) “QPRS” is the correct answer.