To capture dynamic values in a web VUser script, you can use the function "web_reg_save_param".
Option A) web_reg_save_param - This option is correct because the "web_reg_save_param" function is used to capture dynamic values from server responses and store them in a parameter for future use.
Option B) lr_set_debug - This option is incorrect as "lr_set_debug" is used to enable or disable debugging options in LoadRunner scripts and does not capture dynamic values.
Option C) lr_think_time() - This option is incorrect as "lr_think_time()" is used to insert a delay or think time between transactions in a script and does not capture dynamic values.
Option D) None of the above - This option is incorrect as the correct answer is A) web_reg_save_param.
The correct answer is A) web_reg_save_param. This option is correct because it allows you to capture dynamic values in a web VUser script.