Can someone please help me with reading.

D. All of the above

Explanation:

Text evidence for all 3 answers.

There was a decrease in production

The passage says, " At the same time, manufacturing and production were going down and unemployment was rising.

The statement, " production were going down " has the same meaning of decrease ( decrease meaning to go down ) in production.

Many investors began to panic.

In the passage it says this, " In the fall of 1929, investors began to panic. "

So the assumption that investors began to panic is true

There was also inflated stock prices

In the passage it states this, " Because so many people were investing in the market, stock prices increased and exceeded their actual value."

If you didn't know inflated means unreasonably high.

If the price of the stocks exceeded ( surpassed, passed ) their actual value then the stock price inflated.

Then at the end of  the passage it says, " For these reasons, the market crashed The beginning of the Great Depression."

This proves that all three reasons stated had a big part of the market crash which led to the start of the era known as the Great Depression.

Therefore the answer is D. All of the Above

modal adverbs are used to modify specific verbs that consist of a linking verb (verb of being) and sometimes another verb. examples of modal verbs include can, could, may, might, must, shall, should, will and would.

modal auxiliary. an auxiliary verb characteristically used with other verbs to express mood, aspect, or tense. in english, the most common modal auxiliaries are can, could, may, might, must, ought, shall, should, will, and would. also called modal .