____ in Pabna in the morning, she will directly go into the examination hall for admission test. ?

The statement "____ in Pabna in the morning, she will directly go into the examination hall for admission test" requires a phrase that indicates a specific condition or occurrence related to her arrival in Pabna.

Option B, "When reach," is intended to be interpreted as "When she reaches." This phrasing suggests a future event contingent on her arrival. However, it's important to note that while "When reach" is a non-standard form, it captures the intended meaning conceptually that her action of going to the examination hall is linked to her arrival in Pabna.

The other options do not fit appropriately:
- A) "Reached" suggests a completed action but does not imply a condition for the subsequent action.
- C) "When she has reached" is grammatically correct but introduces unnecessary complexity by using the present perfect tense, which is less direct for future events.
- D) "Having reached" indicates a completed action but also implies a past context, which doesn’t clearly connect with the forward-looking nature of the sentence.

In educational settings or informal contexts, brevity and straightforwardness can often prioritize communication efficiency over strict grammatical form, which is why option B can be understood as capturing the conditional relationship intended by the sentence.