Match the following pairs:
| Class of Flares | Possible impact on earth | ||
| a. | Class B | 1. | Can trigger planet-wide radio blackouts and long-lasting radiation storms |
| b. | Class C | 2. | Can cause brief radio blackouts that affect Earth's polar regions and minor radiation storms. |
| c. | Class M | 3. | Small with few noticeable consequences on Earth. |
| d. | Class X | 4. | Too small to harm Earth |
1
a-1, b-2, c-3, d-4
2
a-4, b-3, c-2, d-1
3
a-2, b-3, c-4, d-1
4
a-3, b-1, c-4, d-2