Given that a simple event is one that always results in only one outcome, the correct answer here would be - spinning a spinner and drawing a card from a deck of cards. The other options always have more results - tossing a coin can give either head or tail, drawing 3 cards has three results, and tossing 4 coins can give either 4 heads or 4 tails - so more than one result unline spinning a spinner or drawing one card, which can give one outcome only, thus making it a simple event.