Accredited travel agents were not required to provide advice pertaining to hotels and entertainment when they were organizing travel packages, but many do so anyway in an attempt to secure repeat business.
A.
were not required to provide advice pertaining to hotels and entertainment when
they were organizing travel packages,
but many do so Incorrectcombination of present and past tense changes intended meaning
B.
are not required to provide advice pertaining to hotels and entertainment when they organize travel packages, but many do so CorrectC.
were not required for providing hotel and entertainment advice when they organized travel packages,
but many do it Incorrectidioms issue and combination of present and past tense
D. were not
required that they provide advice pertaining to hotels and entertainment when they organized travel packages, but many had been doing so
Incorrectawkward
E.
had not had the requirement for them to provide advice pertaining to hotels and entertainment when they organize travel packages,
but many do it Incorrectawkward