What does 'trading on the stockmarket' mean in this sentence?

[angiela]

Test No. incompl/advan-10 "Finance (2)", question 3

......... on the stockmarket just before Christmas is usually very slow.

(a) Working
(b) Trading
(c) Pricing
(d) Adding

Test No. incompl/advan-10 "Finance (2)", answer 3

Trading on the stockmarket just before Christmas is usually very slow.

Correct answer: (b) Trading

Your answer was: n/a
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what is the meaning of trading in the sentence?

[Alan]

This simply means doing business - buying and selling stocks and shares.
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