Which of the following were common physical activities in traditional Nigerian societies before Western influence? (a) Formal athletic competitions (b) Western sports (c) Moonlight activities (d) Mili

Before the advent of Western influence, traditional Nigerian societies engaged in various physical activities, often including moonlight activities which could involve games, dances, and storytelling.
The correct option is (c).

$$\boxed{\text{(c) Moonlight activities}}$$

For a tall athlete, an elongated start is generally considered good as it allows them to utilize their longer limbs effectively and maintain balance.
The correct option is (a).

$$\boxed{\text{(a) Elongated start}}$$

Boat regatta, water polo, and canoeing are all aquatic activities. Driving (referring to operating a vehicle on land) is not an aquatic activity.
The correct option is (c).

$$\boxed{\text{(c) Driving}}$$

In table tennis, if a served ball touches the net but still lands on the opponent's side of the table, it is a let ball, and the serve is replayed.
The correct option is (a).

$$\boxed{\text{(a) A let ball}}$$