Each of the participants,
all male adults with obesity, were given a weight management consultation during which they were advised on how to adapt their lifestyle and improving their diet and levels of physical activity
A. all male adults with obesity, were given a weight management consultation during which they were advised on how to adapt their lifestyle and improving their --- subject is each and verb is were. SV error.
B. all male adults with obesity, were given a weight management consultation during which they were advised on how to adapt their lifestyle and improve their --- same SV number problem as in A.
C. all male adults with obesity, was given a weight management consultation during which he was advised on his lifestyle adaptation and improve his --- Unparallel around the conjunction ’and’
D. all male adults with obesity, was given a weight management consultation during which he was advised on how to adapt his lifestyle and improve his ---
the correct choice. E. all male adults with obesity had been given a weight management consultation during which he was advised on how to adapt his lifestyle and improving his --- Let’s not get into an unnecessary debate over ‘ had been given’ is correct or ’ was given’ is correct. This choice is not parallel around ‘and’ and there ends the matter.