Let, $T_{p}$ be "The speaker is playing tennis"
, $T_{w}$ be "The speaker is watching tennis"
, $T_{r}$ be "The speaker is reading about tennis"
Then the advertisement for a tennis magazine states,
$(\overline{T_{p}} \rightarrow T_{w} ) \wedge \left ( \overline{T_{w}} \rightarrow T_{r} \right )$
We need to assume that the speaker can do at most one of these activities at a time.
We can do this by choosing
$T_{w}$ = $T$
$T_{p}$ = $F$
$T_{r}$ = $F$
$\Rightarrow$$(\overline{T_{p}} \rightarrow T_{w} ) \wedge \left ( \overline{T_{w}} \rightarrow T_{r} \right )$
$\Rightarrow$$(\overline{F} \rightarrow T ) \wedge \left ( \overline{T} \rightarrow F \right )$
$\Rightarrow$$(T \rightarrow T ) \wedge \left ( F\rightarrow F \right )$
$\Rightarrow$$( T ) \wedge \left ( T\right )$
$\Rightarrow$ $T$
Hence the answer is B) Watching tennis
