What does "praise" mean?

[NewEagle]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #49 "Up in the Clouds", question 3

Her boss thought she was wonderful and always ......... her to the skies.

(a) complimented
(b) congratulated
(c) flattered
(d) praised

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #49 "Up in the Clouds", answer 3

Her boss thought she was wonderful and always praised her to the skies.

Correct answer: (d) praised
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What does "praise" mean?

NewEagle

[Haihao]

Praise someone to the skies or praise someone sky-high is an idiom, El.

[Dennisnguyen]

Hi,
"flattered" and "praised" are almost the same sense in this context. but "flattered" would be chosen only if there was a prep. "up" following.
Am I right?
Hope to get your reply soon.
Kind regards,
Dennisnguyen.