How far back does title search go?

[Spencer I.]

I am buying a property. The seller purchased the property in 1988. Upon receiving the title commitment, the property is in my seller's name, but there was a break in the chain of title from about 80 years ago. There is no record of previous seller A selling to previous seller B (not my seller). Title company says they want conveyance from previous Seller A to my seller. 

I've done some searching, and previous Seller A's company is no longer in business. 

My question: 

1. Do title company absolutely NEED conveyance even though title is in my seller's name? Will they close the deal regardless?  

2. Will switching title companies be beneficial as other title company may not look back so far? 

3. Is the only way to solve the issue is conveying title from previous seller A to my seller?