Identify the part of the sentence given below that has an error in it.
Has (a) either (b) of you saw (c) my book? (d)

Correct option is C

Option (c) contains an error.
Detailed Explanation (English):
In the sentence “Has either of you saw my book?”, the auxiliary verb “has” is used, which indicates the present perfect tense. In present perfect tense, the structure must be has/have + past participle (V³). However, “saw” is the simple past (V²) form of the verb see, not the past participle. The correct past participle form is “seen”, so the verb usage is grammatically incorrect in part (c).
Correct sentence: Has either of you seen my book?
Grammatical Rule Used (English):
In Present Perfect Tense, we use has/have + past participle (V³) to show an action that is completed but has relevance to the present. Using the simple past form after has/have is grammatically incorrect.
Grammatical Rule Used (Hindi):
Present Perfect Tense का प्रयोग ऐसे कार्य के लिए किया जाता है जो हो चुका है लेकिन जिसका प्रभाव वर्तमान में है। इसकी संरचना होती है:
has/have + क्रिया का तीसरा रूप (V³)।
Has/Have के बाद कभी भी क्रिया का दूसरा रूप (V²) नहीं आता।
Example: She has written a letter.