Mix up or mixing up

[english_fan]

Test No. incompl/inter-59 "Testing, Testing", question 8

In the story of Dr Jekyll and Mr Hyde we see the hero mix something up in a test ......... and then drink it.

(a) tube
(b) pipe
(c) glass
(d) cup

Test No. incompl/inter-59 "Testing, Testing", answer 8

In the story of Dr Jekyll and Mr Hyde we see the hero mix something up in a test tube and then drink it.

Correct answer: (a) tube
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Would mixing something up be correct too?

[Alan]

Yes
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English as a Second Language
You can read my ESL story Subjunctive