idilbayar
Can you please explain why option C fails to form a complete sentence? Option A is a modifier of "young people," and option C also modifies "young people." The sentence already has a main verb, so how does the sentence become incomplete with option C? Furthermore, there is no comma between "young people" and "having," so "having" modifies not the entire clause but "young people." So, what is the problem with option C?
Hi idilbayar,
You've correctly pointed out that
who have... and
having... are both modifiers. In this case however, we must also take the dummy pronoun
it into account. The whole thing ends up looking like this:
\(It_{\textrm{[dummy]}}\ is/was_{\textrm{[}be\textrm{-form]}}\ X_{\textrm{[noun]}}\ who/that_{\textrm{[relative]}}\)
This structure can be
used to add emphasis, and that's what the author is trying to do here.
Option C does lead to a sentence with a subject and verb, but it's incomplete in a different way: if
it becomes a normal pronoun, there's nothing in the sentence for it to refer to (meaning error).
1. It is phones having touchscreens. ← What does the
it refer to in "It is {phones having touchscreens}"?