Consider the phase diagram shown below. 
a. What phase(s) is/are present at point A?
b. What phase(s) is/are present at point B?
c. Name point C and explain its significance.
d. Starting at D, if the pressure is lowered while the temperature remains constant, describe what will happen.
Definitions:
Consumer Price Index
A gauge that tracks the overall variation in prices urban consumers pay for a selection of consumer products and services over a period.
Base Year
A reference year used in economics for comparative purposes, allowing the calculation of index numbers or real values.
Consumer Price Index
An index measuring the weighted average of prices of a basket of consumer goods and services, such as transportation, food, and medical care.
Base Year
A specific year against which economic or financial data is compared to measure economic performance over time.
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