Fill in the blank in the following sentence with the help of given options. The train was about to leave the station when we ____ there.

Correct option is B

The correct option to fill in the blank is (b) reached.
Explanation: The sentence “The train was about to leave the station when we reached there” describes two past actions happening almost simultaneously. Since both events occurred in the past at nearly the same time, simple past tense ( reached) is appropriate, not past perfect ( had reached).
Grammatical rule used: When two past actions occur almost together, both are expressed in simple past tense; past perfect is used only when one action clearly precedes the other.
ग्रैमेटिकल नियम का हिंदी में स्पष्टीकरण: जब दो घटनाएँ एक साथ या लगभग एक समय पर घटित हों, तो दोनों को simple past tense में लिखा जाता है। Past perfect तभी प्रयोग होता है जब एक क्रिया दूसरी से पहले पूरी हो चुकी हो।
Example:
· The bell rang when I entered the class.
Meanings of the other options: · (a) would reach: Used for hypothetical situations, incorrect here. (पहुंचते) · (c) have reached: Present perfect, incorrect for past time reference. (पहुँच चुके हैं) · (d) had reached: Shows one past action before another, incorrect here. (पहुँच चुके थे)