You are given a math word problem and you are supposed to make use of mathematical concepts like probability, combinatorics, linear equations, sequences/series, or simple operators like addition, subtraction, division, or multiplication to answer the given question. Choose the best option from the 5 given options and report that option.

Q: Question: A warehouse is labeling computer inventory with 3-digit codes. Each code is to consist of four digits between the numbers 0 and 9. The manager is debating whether to allow any 3-digit codes to have leading zero's before a non-zero number is used. If not allowed, then numbers like0025cannot be used.
The manager wants to measure the magnitude of the number of 3-digit code possibilities that are lost if he disallows the use of leading zero's. How many such codes would be lost?

 Option A: 981

 Option B: 1000

 Option C: 1011

 Option D: 1101

 Option E: 100

A: Option E
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Q: Question: 0.002 x 0.008 = ?

 Option A: 1.6e-05

 Option B: 0.001

 Option C: 0.01

 Option D: 0.1

 Option E: NONE OF THESE

A: Option A
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Q: Question: A rainstorm increased the amount of water stored in State J reservoirs from 50 billion gallons to 75 billion gallons. If the storm increased the amount of water in the reservoirs to 37.5 percent of total capacity, approximately how many billion gallons of water were the reservoirs short of total capacity prior to the storm?

 Option A:  90

 Option B:  114

 Option C:  124

 Option D: 120

 Option E: 127

A:
Option E
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