The visiting school children circumnavigated around the Dal Lake with visible delight during their visit to Srinagar.

Correct option is C

· Circumnavigated (c): Correct because "circumnavigate" alone already means to travel around or navigate a perimeter, making "around" redundant.
· Circumnavigated about (a): Incorrect as "about" is redundant and awkwardly phrased with "circumnavigate."
· Circumnavigated on (b): Incorrect since "on" suggests a surface or base, which does not fit with the verb "circumnavigate."
· No improvement (d): Incorrect due to redundancy in the use of "around" with "circumnavigated."
Grammar Rule: Avoid redundancy in verb phrases; if the verb itself conveys a direction or movement, additional prepositional modifiers are usually unnecessary and can be grammatically awkward.