Option (d) is correct.

If the statement "Some animals are birds" is given as false, it means that there are no animals that can be classified as birds. In this case, the immediately inferred true statements would be B and C:

B. No animals are birds: Since it is stated that "Some animals are birds" is false, it implies that there are no animals that fall under the category of birds. Therefore, the statement "No animals are birds" can be inferred as true.

C. Some animals are not birds: If there are no animals that can be classified as birds, then it follows that there must be some animals that do not fall under the category of birds. The statement "Some animals are not birds" can be inferred as true in this context.

On the other hand, A. "All animals are birds" cannot be immediately inferred because the original statement contradicts this claim; and D. "All birds are animals" cannot be immediately inferred because the original statement does not provide any information about all birds being animals.

Therefore, the correct answer is B and C.

विकल्प (d) सही है।

"कुछ पशु पक्षी होते हैं" यह कथन 'I' प्रकार का प्रोपोज़िशन है। यदि 'I' प्रोपोज़िशन गलत है तो ऐसी दशा में 'E' तथा 'O' प्रकार के प्रोपोज़िशन सत्य होगें।

अर्थात, "कोई भी पशु पक्षी नहीं होते है"-['E' प्रकार का प्रोपोज़िशन] और "कुछ पशु पक्षी नहीं होते हैं"-['O' प्रकार का प्रोपोज़िशन] - दोनों ही कथन सत्य होंगे।