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Consider the following chemicals:
1. Benzene
2. Carbon tetrachloride
3. Sodium Carbonate
4. Trichloroethylene
Which of the above is/are used as dry cleaning chemicals?

Options

(a)

1 Only

(b)

2 Only

(c)

1, 2 and 4 Only

(d)

1, 2, 3 and 4

Answer

(B)