The correct answer is b. as long as
This builds a sentence whose realization depends on a fulfilled condition. Other options would create ungrammatical or nonsensical sentences.
So based on your question that states a few trees in garden and one of them is a pear tree, there are pears. But a strong wind blew, there were neither pears on the tree nor on the ground. I think the best explaination to this statement is that some one might pick up the pear tree or it can be that its the wrong tree that is blown.
Scannable resumes are a brief account of a person’s education, qualifications, and previous experience, that can be scanned electronically into an employer's database.
Hope this helps