Fill in the blanks.
(i) The number 825642 rounded off to nearest thousand is P.
(ii) Estimated product of 4023 and 198 is Q.
(iii) CXXXI is written in Hindu-Arabic numeral as R.
| P | Q | R | |
| A | 820000 | 800000 | 131 |
| B | 826000 | 800000 | 131 |
| C | 826000 | 850000 | 135 |
| D | 850000 | 800000 | 135 |