Which statement is most appropriate?

a. Another way of viewing the workshop process is to suggest that the facilitator may assume a low profile early on as the idea of operational risk management and the CRSA process is sold to the group. As proceedings progress, the facilitator gradually moves into the foreground as the group become more confident about working without prompts.

b. Another way of viewing the workshop process is to suggest that the facilitator may assume a clear presence early on as the idea of operational risk management and the CRSA process is sold to the group. As proceedings progress, the facilitator gradually moves into the foreground as the group become more confident about working without prompts.

c. Another way of viewing the workshop process is to suggest that the facilitator may assume a clear presence early on as the idea of operational risk management and the CRSA process is sold to the group. As proceedings progress, the facilitator gradually moves into the background as the group become more confident and works so long as it is given prompts.

d. Another way of viewing the workshop process is to suggest that the facilitator may assume a clear presence early on as the idea of operational risk management and the CRSA process is sold to the group. As proceedings progress, the facilitator gradually moves into the background as the group become more confident of working without prompts.