Difference between say and tell

[mohammad]

Test No. incompl/elem-20 "Where am I?", question 9

Why do you ......... that?

(a) tell
(b) announce
(c) say
(d) speak

Test No. incompl/elem-20 "Where am I?", answer 9

Why do you say that?

Correct answer: (c) say
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i wonder if u could tell me why didn't you use tell or announce however they seem correct, please.

[Alan]

Here you need say because we are referring to the words spoken. Tell usually has an object as in Tell me where I should go. Announce is too formal because it is a word used to describe an important statement. The committe will announce the name of the winners.
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English as a Second Language
You can read my ESL story Book Expressions

[Gerson]

thanks for the explanations.

[Torsten]

You're welcome .
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Test Of English for International Communication
TOEIC Preparation & TOEIC Vocabulary