Final answer:
Savers are the beneficiaries of an unexpectedly low inflation rate, as the real value of their savings and the interest earned on these savings is not eroded as much as it would be with higher rates of inflation.
Step-by-step explanation:
When inflation is unexpectedly low, different groups in the economy are affected in various ways. The group that is likely to be the beneficiary of an unexpectedly low inflation rate is savers (B). This is because the value of the money saved does not erode as quickly as it would with higher inflation. Savers earn interest on their deposits, and when inflation is low, the real value of the interest earned is higher than it would be if inflation were high.
For example, if someone is saving money in an account with a fixed interest rate, a lower inflation rate would mean that the purchasing power of the interest earned is preserved. This contrasts with borrowers, who might prefer higher inflation since it can reduce the real burden of their fixed-rate debts; investors, whose returns may or may not benefit from low inflation depending on the nature of their investments; and governments, which may find borrowing costs to be lower but might miss the chance to reduce the real value of debt through inflation.