Switch from absorption costing to activity based costing

A company produces a range of products and uses an absorption costing system. Which two of the following are unlikely to be a consequence of the company switching to an activity based costing (ABC) system?

Which two of the following are unlikely to be a consequence of the company switching to an activity-based costing (ABC) system?

Indirect overheads will be shared between products on fairer bases.
Product pricing decisions will be improved.
The prime production cost of each product will fall.
Cost control on indirect overheads will be harder to achieve.
Total production cost of each product will change.

I dont understand, how will total production cost of each product change? The rest of the options – I do understand.