very unsure

[English Learner]

Business Idiom in English, Intermediate level

ESL/EFL Test #96 "Letter of Complaint (3)", question 4

and was very ......... as to when he would be able to find the right part and get it back to me.

(a) unable
(b) unsure
(c) unskilled
(d) untrained

Business Idiom in English, Intermediate level

ESL/EFL Test #96 "Letter of Complaint (3)", answer 4

and was very unsure as to when he would be able to find the right part and get it back to me.

Correct answer: (b) unsure
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what the difference of unskilled and untrained

[Beeesneees]

unskilled - having no skill.
untrained - not having been trained.
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Cheers m' dears!