'came to be apart' vs. 'came apart'

[Sergue]

English Grammar Tests, Elementary Level

ESL/EFL Test #87 "Common English Errors (3)", question 6

As soon as I picked up the rare object, it ..........

(a) was not together
(b) came to be apart
(c) came apart
(d) was separated

English Grammar Tests, Elementary Level

ESL/EFL Test #87 "Common English Errors (3)", answer 6

As soon as I picked up the rare object, it came apart.

Correct answer: (c) came apart

Your answer was: incorrect
As soon as I picked up the rare object, it came to be apart.
_________________________

Dear sir,
Would you mind to explain this sentence for me
Why use "came apart"

Sergue

[Conchita]

In the sentence:

"As soon as I picked up the rare object, it came apart"

the phrasal verb came apart is used to indicate that the object broke, came to pieces or separated into pieces.

[Watie]

Why Could I use "was separated"?

The word "was separated" explain separated object also..

[Aliraf62]

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Hi Watie

Come apart is used when something splits or falls into pieces or fragments. Separate sounds more general and does not necessarily denote falling apart in pieces.
To me the following sentence appears to be acceptable:

As soon as I picked up the rare object, it separated into pieces.

All the best
Ali