In the following passage, some words are highlighted in bold with numbers indicating them. Choose the most appropriate replacement for each numbered w...

In the following passage, some words are highlighted in bold with numbers indicating them. Choose the most appropriate replacement for each numbered word from the options given. If the bold word is already correct, select option (E) "No replacement required".

Researchers have proved that long hours of repulsive (17) sitting can lead to a number of health complications. This growing concern (18) has pushed many corporate offices to opt for a standing work desk or make changes to the employee working schedule by organising ergonomic sessions, embracing (19) the importance of right sitting posture and regular exercise. Sitting for more than eight hours can lead to postural problems like disc damage, and strained neck in the long run. Many corporate employees who work in sitting position for long hours combat (20) of these postural problems. Sitting in upright position without crouching forward and taking a five minute stroll every hour can minimise the risk. Long hours of sitting can lead to imbalances in spinal structure including disc damage, inflexible spine. When a person complains of postural problems, a/an reckoning (21) is done by an X-ray or MRI scan. Edifice (22) exercises are suggested to correct the damage. Patients are also recommended to engulf (23) physiotherapy sessions, if required.

Choose the correct replacement for (21):