The correct option is B iv, i, iii, ii
The procedure is that the joint meeting of the houses is summoned by the President to halt the proceedings with the bill but he can summon the house any time after the date of his notification, if he does, the houses have to meet accordingly. Hence, Option A, that is, " Where the President has under clause, notified his intention of summoning the Houses to meet in a joint sitting, neither House shall proceed further with the Bill, but the President may at any time after the date of his notification summon the Houses to meet a joint for the purpose specified in the notification, and if he does so, the Houses shall meet accordingly." is correct. The rest of the options do not express this logical sequence, hence incorrect.