Can someone help me with this answer thank you.

B. ow in knowing

Explanation:

In Phonetics, 'ow', 'oa', and 'oe' usually produce the same sound when pronounced which is the long o sound.

This is why the 'ow' in 'knowing' is pronounced in the same way as the 'oa' in 'approach'. The 'ow' in 'downstairs' is not similar to them due to it's position in the word having changed its sound.

op: object of preposition

yes they most likly are and have planed t try to bring human life and supplies there also(due to global warming and other harmful resorces)