Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Barium carbonate is insoluble in water and is highly stable.
Reason (R): The thermal stability of the carbonates increases with increasing cationic size.
Choose the most appropriate answer from the options given below :

• A

  (A) is true but (R) is false.
• Correct answer
  B

  Both (A) and (R) are true.
• C

  (A) is false but (R) is true.
• D

  Both (A) and (R) are false.

Hence, the correct answer is option: 'B'.