Final answer:
The pair of independent events is the youngest puppy being female and exactly two consecutive puppies being males B) (a and c).
Step-by-step explanation:
The question asks which pair of events are independent when looking at the gender of the three puppies the Leons have. To answer this, we need to find a pair of events where one does not affect the probability of the other happening. Event a being "The youngest puppy is a female" and event c being "Exactly 2 consecutive puppies are males" are independent events. This is because the gender of the youngest puppy does not affect the gender sequence of the other two puppies. The correct answer is that events a and c are independent, so the choice is B. a and c.