Correct option is B
During the summer monsoon season a tropical easterly jet stream forms over the southern part of the Indian Peninsula.
Jet streams are fast-moving air currents in the upper atmosphere, typically found in the tropopause.
The Tropical Easterly Jet (TEJ) appears during June to September, centered around 15°N to 20°N latitude.
It influences the southwest monsoon circulation over the Indian subcontinent.
TEJ flows from east to west.