Radiation exposure to 1,000 - 2,000 msv can caouse health problems such as a) fatigue b) temporary sterility in males c) abortion of pregnancies of less than two months d) vomiting e) all of the above

The answer to this question would be: A)fatigue 

Radiation is expressed in sievert unit and mSv means milli sievert which was equal to 1/1000 sievert. The effect of 1,000 - 2,000 mSv (equal to 1-2 Sv) will cause fatigue or nausea. Higher doses about (2-3 Sv) could cause vomiting. 
Exposure of 1,000 mSv also known to increase the risk of cancer by 5%

30litre of li2o is 1.0002mole approximately 1 mole

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