D. 21 I believe but idk and rn just trynna put in 20 characters but yw
The government has a central bank that is oftentimes referred to the Federal Reserve Bank (or just Fed).
Answer: Option (D) is correct
Explanation:
Economic efficiency is referred to as the situation where all commodities and factors of production residing within an economy are allocated or distributed in most efficient way in order to eliminate or minimize waste. It also implies to an state(economical) where resources are being optimally allocated in order to serve individuals or other entity in best way possible while trying to minimize inefficiency and waste.
The answer is
s waves cannot pass thru the outer core
