In an ABABACA form the A section would most likely be heard:
O A 1 time
O & 2 times
OC 4 times
OD 3 times

The answer will

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Material safety data sheetswhen working with any type of chemical the should be posted in a conspicuous place in the work areamsdsif a material does pose a health hazard teachers shouldobserve appropriate precautions when they or their students handle the materialmsds are available fromproduct manufacturesmsds sheets must beavailable in shop/science classes at all times