If 2 is added to each odd digit and 1 is subtracted from each even digit in the number '2586473', which of the following digits will be third from the left in the new number thus formed?

Given: 2586473

Logic: Add 2 to each odd digit, and subtract 1 from each even digit.

odd number: 5 + 2 = 7; 7 + 2 = 9; 3 + 2 = 5

even number: 2 - 1 = 1; 8 - 1 = 7; 6 - 1 = 5; 4 - 1 = 3

Therefore, the new number formed is '1775395'.

Thus, the digit at the third from the left in the new number is '7'.

So, the correct answer is (a).