<p>(Because of pleading in vain for improved maintenance services, the tenants refused) to pay rent until the landlord agreed to make the much-needed repairs.</p>
<p>B) Having pleaded in vain for improved maintenance services, the tenants refused</p>
<p>D) The tenants pleaded in vain for maintenance services to improve, then refusing </p>
<p>Answer is B, but what about D? What error does it have</p>