B is correct.
Original Sentence was as below, from WSJ:
That is still significant progress. Looking back over an 80-year lifespan, a typical person in a wealthy country would have seen his or her annual income quadruple. But looking from one year to the next, the improvements in living standards that come from higher incomes are glacial.
But I also have confusion about But at the beginning of a sentence.
Another example, from the same article, is as below:
Historically, boom times are the exception,
...
Original Sentence was as below, from WSJ:
That is still significant progress. Looking back over an 80-year lifespan, a typical person in a wealthy country would have seen his or her annual income quadruple. But looking from one year to the next, the improvements in living standards that come from higher incomes are glacial.
But I also have confusion about But at the beginning of a sentence.
Another example, from the same article, is as below:
Historically, boom times are the exception,
...
