Correct option is A
Statement: "The electricity board has started going from home to home to collect bills."
Assumptions:
The electricity board considers going home to home an effective way to collect bills.
The fact that the electricity board has started this practice suggests they consider it effective, or at least worthwhile, as organizations typically adopt methods they believe will work. So, Assumption A is implicit.
B. The electricity board has increased its focus on collecting bills.
By initiating a new method (going door to door), it implies the electricity board is taking more proactive measures, which suggests an increased focus on collecting bills. Therefore, Assumption B is also implicit.
Conclusion: Both assumptions are implicit.
The correct answer is: (a) Both A and B are implicit.