"looked at" vs "looked up to"

[Ilsas]

English Language Tests, Intermediate level

ESL/EFL Test #140 "Idioms with the phrasal verb look", question 4

I have always ......... my grandfather because he has lived such an amazing life.

(a) looked at
(b) looked for
(c) looked up to
(d) looked after

English Language Tests, Intermediate level

ESL/EFL Test #140 "Idioms with the phrasal verb look", answer 4

I have always looked up to my grandfather because he has lived such an amazing life.

Correct answer: (c) looked up to
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give me the explanation of the 4 question

my option is (a)

Ilsas

[Mister Micawber]

.
(a) looked at = observed
(b) looked for = searched for
(c) looked up to = repected; admired
(d) looked after = taken care of

Only C fits the intention of the sentence ('because he had an amazing life').
.
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Native English teacher at Mister Micawber's