The formula for calculating the crude death rate is

Correct option is B

Ans(b) Sol. Deaths in January × 12 / mid-year population × 100: It assumes that the deaths in January are representative of the entire year. However, deaths fluctuate throughout the year due to various factors, so extrapolating January's data to the entire year is not a reliable method.
No. of deaths during the year / mid-year population × 1000: This is the correct formula for calculating the crude death rate (CDR). It uses the total number of deaths in a year and the mid-year population (which is an average of the population over the year). Multiplying by 1000 adjusts the value to a per-1000 basis, making it easier to compare across populations.
Total No. of deaths due to a particular disease / Total no. of cases due to same disease × 100: This formula calculates the case fatality rate (CFR), not the crude death rate. The CFR measures the severity of a specific disease by determining the percentage of deaths among diagnosed cases.
Total deaths during the year / Total population × 100: This formula resembles a crude mortality rate, but it does not multiply by 1000 to standardize the value per 1000 individuals, which is the standard practice for CDR calculations.