specializes in the analysis of handwriting

[hmboy17]

I do not have the answer for this question. But I am confused between a & b. Pls share ur ans.

A firm that specializes in the analysis of handwriting claims from a one-page writing sample that it can assess more than three hundred personality traits, including enthusiasm, imagination, and ambition.
(A) from a one-page writing sample that it can assess
(B) from a one-page writing sample it has the ability of assessing
(C) the ability, from a one-page writing sample, of assessing
(D) to be able, from a one-page writing sample, to assess
(E) being able to assess, from a one-page writing sample,

[blackarrow]

I would go for D

I think its the case of Idiom Claim.. to

The only option is D

[rseeker2]

But shouldn't 'to be able to assess, from a one-page writing sample,' be more appropriate?