Exams

In  a  boost  to  its  non-proliferation credentials, India joined the Missile Technology Control Regime (MTCR) at   a   ceremony   in   South   Block. India’s  MTCR  membership  would help in furtherance of international non-proliferation  objectives,  India would  enjoy  full  participation  in organisational  activities,  India  had intensified     efforts     at     gaining membership   of   the   MTCR,   the NSG,   the   Australia   Group   and Wassenaar     Arrangement     since getting  a  waiver  at  the  NSG  in 2008. Membership of these groups would    help    India    trade    more effectively    in    critical    high-tech areas

The error is in third part. Replace ‘good’ with ‘correct’. English is not good or bad, but it can be correct or incorrect. We can also say ‘All of them speak English well’, or ‘All of them speak fluent English’. The error remains in part c.