Answer:
A) The acceptance is effective upon dispatch
Explanation:
In the given scenario an offer was made by Judith using normal letter, she did not state the authorised means by which the acceptance should be made.
If Helga accepts the offer and chooses and means to convey the acceptance, it will be acceptable as there is no specific way stated by Judith.
So when Helga responds by using a normal letter, the acceptance is effective when she dispatches the letter.
If however Judith stated an authorised means of acceptance, Helga would have to comply to make sure her acceptance is valid