Which of these is not an si base unit?

a. Meter

b. Pound

c. Kelvin

d. Ampere

The pound because the pound is the only English unit listed, therefore it can not be a base metric unit. Meter is standard metric unit for length, Kelvin standard unit for temperature, and ampere standard unit for electric current.

B. Pound. The base unit for pound is gram! That is how I understand it