To answer this question, we need to know the parentage of Raja Tej Singh.
Option A) Mehboob Khan - This option is incorrect because Raja Tej Singh is not the son of Mehboob Khan.
Option B) Arcot Nawab - This option is incorrect because Raja Tej Singh is not the son of Arcot Nawab.
Option C) Swarup Singh - This option is correct because Raja Tej Singh is indeed the son of Swarup Singh.
Option D) Tej Singh - This option is incorrect because Raja Tej Singh is not his own son.
The correct answer is C) Swarup Singh. This option is correct because Raja Tej Singh is the son of Swarup Singh.