Adding up?

[Stupy]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #766 "Money: Phrasal Verbs (1)", question 2

Why don't you add ......... all of your monthly expenses and I'll help you formulate a budget.

(a) on
(b) down
(c) up
(d) through

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #766 "Money: Phrasal Verbs (1)", answer 2

Why don't you add up all of your monthly expenses and I'll help you formulate a budget.

Correct answer: (c) up
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what do you mean by through ?

[Mister Micawber]

Don't you have a DICTIONARY? It has no special meaning here; it is a wrong answer.
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Native English teacher at Mister Micawber's