Step 1: Concept
Probability of mutually exclusive events in a deck of cards.
Step 2: Analysis
A deck has 4 suits: Hearts, Diamonds, Spades, and Clubs (13 cards each).
Total favorable cards = 13 (Diamond) + 13 (Spade) + 13 (Club) = 39.
Step 3: Calculation
Probability = $\frac{39}{52} = \frac{3}{4} = 0.75$.
Step 4: Conclusion
The probability is 0.75.
Final Answer: (B)