मेरे गाँव में एक मंदिर है।
Step 1: Identify structure.
The Hindi sentence expresses existence. English uses the existential "there is/are" to introduce something's presence.
Step 2: Choose correct article and noun order.
"एक मंदिर" $\rightarrow$ "a temple"; place phrase "in my village" goes at the end.
Step 3: Build the sentence.
There is a temple in my village.
Step 4: Eliminate wrong options.
(A) "Temple is in my village" answers Where is the temple?—not a natural existential statement.
(B) Word order is incorrect.
(D) Jumbled/incorrect meaning.
मैं एक पत्र लिखने जा रहा हूँ।