The answer is:
My mother is very tall but my father is even taller.
Conjunctions join clauses, words and phrases and they are usually used to avoid a sequence of short sentences. For example, <em>and, but, </em>and <em>or</em>.
In this case, the most suitable sentences to combine with a conjunction like "but" are the ones whose subjects are related (mother and father) and whose predicates have a similar structure: both describe height and one has a comparative form of the adjective tall, so they can be easily joined.
I think it’s b because it presents the actions
She was the first female aviater to fly ALL ALONE across the atlantic ocean... in that ruggedy thing. Thats a courageous thing to do, and especially alone
