How do supporting details reinforce the central idea in this passage? Many people have heard the expression "to bury your head in the sand
like an ostrich." This means refusing to see or deal with a problem.
However, it is not actualy true that ostriches bury their heads in the
sand when predators are near. Ostriches do dig holes in the ground
with their beaks, but this is to store their eggs, not to hide. When they
are scared of predators, ostriches usually run away.
O A. The supporting details argue that ostriches should be more
OB. The supporting details show why ostriches are unable to deal with
OC. The supporting details describe the way ostriches are used in a
OD. The supporting details explain that a common assumption about
respected.
problems.
common expression.
ostriches is not true.

D. The supporting details explain that a common assumption about ostriches is not true.

Explanation:

The main idea of a text is the main point the author is making. Supporting details are pieces of information that prove, illustrate, explain, or clarify the main idea.

The given passage tells us about the expression to bury your head in the sand like an ostrich. The main idea is that this expression is based on a wrong assumption - that ostriches bury their heads in the sand when predators are near. The supporting details provide additional explanation. They tell us why this assumption isn't true, giving us the correct information.

the antonym of esurient is abstemious.

the present continuous is a verb tense which is mainly used to indicates that an action is in progress at the moment of speaking.  

it is formed using: person + verb to be (am/is/are) +verb + - ing form  

example: i am studying at this moment .

in addition, the present continuous is also used in order to express things that will or will not happen in the near future.

example: i am having dinner with some friends tonight.

the speaker sometimes   uses it   to express that an action is repeated and it causes irritation on the part of the speaker

example: my sister is constantly complaining about everything.