Question

choose the option that is, or that includes, a run-on sentence (a comma splice or a fused sentence).
some people who work at home miss socializing with their colleagues; in fact, isolation and depression are two of
the most common hazards of working at home.
some people who work at home miss socializing with their colleagues in fact isolation and depression are two of
the most common hazards of working at home.
some people who work at home miss socializing with their colleagues; indeed, isolation and depression are two of
the most common hazards of working at home.
some people who work at home miss socializing with their colleagues. in fact, isolation and depression are two of
the most common hazards of working at home.

Explanation:

A run - on sentence (fused sentence or comma splice) occurs when two independent clauses are joined without proper punctuation or a conjunction. The second option "Some people who work at home miss socializing with their colleagues in fact isolation and depression are two of the most common hazards of working at home" has two independent clauses ("Some people who work at home miss socializing with their colleagues" and "isolation and depression are two of the most common hazards of working at home") joined without proper punctuation (like a semicolon, period, or conjunction). The other options use a semicolon, a period, or a semicolon with a transitional word correctly to separate the clauses.

Answer:

B. Some people who work at home miss socializing with their colleagues in fact isolation and depression are two of the most common hazards of working at home.