Step 1: Think about where he lived.
Shakespeare was born in Stratford-upon-Avon in England and worked in London. A writer working for London audiences of his time wrote in the language they spoke.
Step 2: Think about the audience.
The audience at the Globe Theatre spoke English. Plays were written to be heard and enjoyed by them, so the dialogue, verse and songs are all in English.
Step 3: Remove the wrong languages.
Romanian, French and German are languages of other countries. Plays of Shakespeare exist in those languages only as translations made after his death, not as his own writing.
Step 4: Pick the right one.
That leaves English, which is option 2.
Final Answer:
The answer is option (2), English.