Rearrange the parts of the sentence in correct order.
Thorium has
P. and is part of a nuclear programme in India
Q. of nuclear reactor in countries including
R. been tested as a fuel in other types
S. the United States, Germany and the United Kingdom,

Correct option is A

The sentences can be rearranged in the following order to make it grammatically and logically correct:
 R. Thorium has been tested as a fuel in other types: This part of the sentence talks about the use of thorium as a fuel in other types of nuclear reactors.
 Q. of nuclear reactors in countries including the United States, Germany, and the United Kingdom: This part of the sentence gives examples of the countries where thorium has been tested as a fuel in nuclear reactors.
 S. and is part of a nuclear programme in India: This part of the sentence talks about how thorium is also part of the nuclear program in India.
 P. The sentence ends with the missing part which could be something like "This makes thorium an important resource for nuclear energy worldwide."
 Therefore, the correct order of the sentence is "RQSP."