The images show two different fronts. which fronts are shown? item a shows a cold front, and item b shows a warm front. item a shows an occluded front, and item b shows a cold front. item a shows a warm front, and item b shows a stationary front. item a shows a stationary front, and item b shows an occluded front.

The best answer would be:

The last option.

ITEM A SHOWS A STATIONARY FRONT, AND ITEM B SHOWS AN OCCLUDED FRONT.

If you'd like to know more about this, read on:

As you can see in item A, you have a warm front and cold front colliding. If neither will be displaced in this collision, a stationary front forms. You would expect rain, fog, snow or clouds when a stationary front forms because the vapor in the warm front condenses when it comes into contact with the cold front.

In item B on the other hand, you can see two cold fronts, and warm front that gets caught in between the two. When this happens, an occluded front forms. The warm air mass is pushed upwards and as a result, the temperatures at ground level drops. Occluded fronts cause clouds, rain or snow.

ń, wǒ shuō yīngyǔ, dàn wǒ huì shuō qítā yǔyán, rú xībānyá yǔ fǎyǔ yìdàlì yǔ hé pǔtōnghuà, suǒyǐ bùyào pànduàn, dànshì