when to repeat the foundation word in a set and when is it redundant

For example:

(1) The Kingdom requires its subjects to abide by its laws, adhere to its moral doctrine and pay taxes.
(A) to abide by its laws, adhere to its moral doctrine and pay
(B) to abide by its laws, to adhere to its moral doctrine and to pay

Here the answer is A, and B is eliminated because it's considered wordy to add "to" in front of each word

(2) Among the members of the company lauded for their notable effort were those from the Midwest division who were either actively involved in improving the customer service experience or developing new approaches to long term customer relationship management.
(A) in improving the customer service experience or developing new approaches to long term customer relationship management.
(B) in improving the customer service experience or in developing new approaches to long term customer relationship management.

Here A is wrong because it's not considered parallel because it's missing the "in" after the or and B is correct because it has the "in" after the or in "in developing"



Confused about this topic. When is it considered redundant and wordy and when is it considered required and considered not parallel without.