Error spotting (dangling participle & idiom 'dream of' + correct infinitive): Identify the erroneous segment (A/B/C) — choose D if there is no error — 'Having read a number of stories / about space travel / his dream now is about to visit the moon / No error.' Ensure the opening participial phrase modifies the right subject and the dream construction is idiomatic.

Given data

• (A) Having read a number of stories
• (B) about space travel
• (C) his dream now is about to visit the moon
• (D) No error.

Concept/Approach: Dangling participles and correct verb patterns with 'dream'
The introductory participial phrase 'Having read…' must modify the grammatical subject that follows. Here, the subject is 'his dream', which cannot have read stories — that is a classic dangling modifier. In addition, the idiom is 'dream of + -ing' or 'his dream is to + verb'. The phrase 'is about to visit' indicates imminence, which changes meaning.

Step-by-step correction
1) Supply the logical subject: 'Having read a number of stories about space travel, he now dreams of visiting the moon.'2) Or keep the 'dream' noun: 'Having read a number of stories about space travel, his dream is to visit the moon.'

Verification
Both corrected versions fix the modifier and use the idiomatic pattern: 'dream of visiting' / 'dream is to visit'.

Common pitfalls
Letting a participial opener modify a non-human noun; using 'about to + verb' where simple 'to + verb' or 'of + -ing' is intended.

Final Answer
(C) 'his dream now is about to visit the moon' is erroneous → revise as above.